More than one Hierarchical Taxonomy and SEO

All content types have a permastruct that dictates the single pattern all canonical URLs for that content type will follow, by default this contains only a single taxonomy (or none at all), making that aspect a non-issue.

As for duplicate content, inject noindex on whatever pages you don’t want indexed, you can do this with the wp_head action and the general is_archive check, or use one of the popular SEO plugins if you’d like to have a UI to manage it.