There’s a somewhat related topic: How to properly set up a pinned "user reviews" for my trading category?
I went the most simple way. A pinned topic where users post their review.
I also added a placeholder form so users can quickly find mentions in the topic, to quickly get a given user’s feedbacks.
I wish the topic couldn’t be unpinned or have any other option to have it at the top of category, but I haven’t explored much yet.