Yes, you can mix WordPress and non-WordPress together. You just need to be careful of files and filenames, as well as URL rewrites. You’ll also need to consider file structure so you don’t have things stepping on each other.
The ideal in my opinion is to maintain WordPress in a subfolder. Note that that is not the same as running it in a subfolder. I’m just talking about where the files go. That way you’ll keep them separate from anything else you are doing. See Giving WordPress Its Own Directory in the Codex for more info.
You probably will need to run WP in a separate directory as well (aside from what I mentioned above). This would be due to the loader scripts in the index.php file. That will probably conflict with the other CMS if you try to run them from the same URL. You might be thinking “that doesn’t make any sense,” but keep in mind that multisite will make the subsites a directory lower than the main site.
Related Posts:
- Moving a WP Multisite to a subdirectory
- Multisite in subfolder – How to make new sites to be in same level subfolders as the main site
- How to individually set WP_DEBUG on a sub-directory multisite?
- Benefits or Problems for using Sub-Directory vs Sub-Domain install of WP Network
- Multisite: differences between subdomain and subdirectory mode? Can it be switch after installation?
- Running several WordPress sites on same core / plugins?
- NGinx + WordPress Subdomain Multi with core in Subdirectory
- Multisite installation combining subdomains and subdirectories
- Suppress subdirectory from WordPress Multisite primary URL
- Subfolder multisite issue. Themes and plugin files 404
- How to do Domain Mapping to Subdirectories?
- Limit multisite/network site names to a property of the user
- On WordPress Network(multisite), Sub Blogs in Subdirectories or Subdomains? What’s better?
- Change multi-site installation from sub-domains to sub-directories
- Subdirectory multisite installation with several domain names?
- Can’t access WordPress multisite after connecting to domain
- WordPress multisite subdirectory on nginx behind reverse proxy
- Media library not loading after switching the main site of multisite
- Installing multisite on domain with existing subdirectory wordpress installations
- Depth > 2 possible with multisite?
- How to run a subdirectory multisite install under a subdomain
- Make a user administrator to a sub directory site and a contributor to main site in multisite network
- What would you recommend for hosting 10+ individual wordpress websites?
- Multisite domain naming
- Multisite setup help – plain domain/subsite always redirects to domain with subdir multisite
- Multiple wordpress installations that shares WordPress & Theme but with separated database
- WordPress Multisite new sites in directory
- multisite subdomain behind reverse proxy
- Multisite Subdirectory with same domain subdomain
- How to host unrelated pages on WordPress domain
- One Domain, Two Installs of WordPress
- Multisite installation on an existing single installation
- Will WP work on a multi-server environment? [duplicate]
- why there is a large file named core in wpmu’s directory?
- Multisite – big hosting package or several hosting packages?
- Multisite – One Site with multiple URLs
- Sub-sub folders of WordPress Multisite subdirectory
- How to organize my js files
- After setting up multisite on localhost, requests to localhost redirect to production domain
- Working with Reverse Proxies and Multisite Installation
- How much resources are good enough for 3.9.2
- Can I use the same Folder name as a Multisite Blog?
- Multisite for main in subdirectory, subdomain and subfolders (EN/ES)
- Infamous admin login redirect
- How can I install WordPress as blog provider , stable?
- Trying to Decide Between Reverse-proxy and Multisite
- How to use the same “wp_posts” table for different subdirectories in the same DB?
- multisite installed on subdomain now want another subsite on subdirectory
- Structure of multilingual and multiregional directory listing website for translation
- Problems with WordPress multisite directories/url structures and admin access after migration
- How do I split a single WPML site with 6 languages (English is Main) into Multisite with 5 subfolders
- Sub-directory domain on subdomain multisite?
- Using multisite, how can I get two different sites on the network to have different active themes?
- Max number of sub folders
- Multisites with different root directory
- WordPress Multisite subdomains and sharing the same upload folder
- WordPress Multisite with thousands of blog
- Nested folder paths for WordPress multisite
- WordPress Multisite redirect loop
- Synchronize wordpress site between two different servers
- Multisite, different domains, optional subdirectory, and htaccess
- Subdirectory and domain multisite installation
- Installed in root, want second in subdirectory
- WP Multisite .htaccess interferes with cgi-bin
- Multisite installation without using domain root
- Moved my site to new host now getting 404
- Primary site file uploads failing, subdirectory subsites upload fine
- How to put a Custom Folder under one sub-site of Multisite WP?
- How can I set up a completely separate (not multisite) WordPress installation as a subdirectory of an existing WordPress blog?
- How do I make a copy of WordPress to other folder
- Are there any hosting companies that are already setup and configured for TLD domain mapping?
- Is it possible to install a different wordpress installation in a subdirectory? [duplicate]
- Moved WP Multisite, cannot access sites
- Multi site root site installed on subdomain, with child sites as subdirectories
- WordPress multisite with subdomains behind nginx reverse proxy using subdirectories
- Best way to set up multiple urls for the same WordPress site?
- WordPress: How to change name of ADD-ON domain’s folder and also change/rename all references to it
- How to approach prefixing the path of a multisite sub-directory install?
- phpmyadmin not working with wordpress multisite subdirectory
- How to use WordPress Multisite With Different Domain Names?
- How To Add Custom Form Fields To The User Profile Page?
- Where are available Roles Defined in the wp_ database?
- restore_current_blog() vs switch_to_blog()
- Can i merge 2 new WP_Query($variable) ‘s?
- How to disable a network enabled plugin for just one site?
- How to reliably flush rewrite rules on multisite?
- Site Redirecting to wp-signup.php
- Cookies in multisite where network sites have their own domain name
- Convert a Multisite WordPress install into a Single site
- WordPress MultiSite Active Directory integration and site privacy
- WordPress Job Interview Preparation
- How to add Custom Blog Options to new blog setup form?
- How can I trust switch_to_blog()?
- Remove the blog slug from WordPress Multisite root node
- Why are my roles not visible in a Multi-site/Network?
- Site admin in a network install can’t edit users?
- How to use same email for multiple users
- How to run an activation function when plugin is network activated on multisite?
- Specific upload folder for PDFs in custom Post type in WP multisite
- What is the correct way to map multiple domains in a WordPress 4.1 multisite install?