Can you explain? Are you manually setting tags for every anime you add? How does it work with requests made thru Seerr?

I'm not using seerr, I've used overseer and jellyseer for a while years ago, but as I'm the only person interacting with radarr/sonarr... The value wasn't there for me.

I suspect it's would still work, but haven't tried it out

Sonarr/radarr has the ability to configure multiple library roots. Those are available in a drop-down when adding a new series through the (son|rad)arr interface

This is eg /media/(anime-series|series) for me. Then I defined a rule for those paths to add an anime|lifeaction Tag.

This then controls the tracker and quality profiles, as well as language preferences etc