Where to put my global functions?

Thanks to https://salferrarello.com/functions-plugin-mu-plugin-wordpress/

I was able to confirm when Code Runs

All of the code across the different files of WordPress can be thought
of as one big list of instructions. The code is run line by line
starting at the beginning of this list through to the end of this
list. The order is essentially.

1. the WordPress
2. core code
3. mu-plugins
4. plugins
5. functions.php
6. the theme code for the specific template being displayed

But it doesn’t answer the order MU_plugins are run (alphabetical, order of importance?)

So my currently solution was to add

include('/my-functions.php');

to any MU-Plugin file that uses ‘../mu-plugin/my-functions.php’.
It works.