I have an Arr setup with Plex and it’s great. Basically I add a TV series or movie to Sonarr/Radarr, they will then use Prowlarr to find torrent, then it will get sent to my torrent client, and then Plex will eventually show the content. It’s one of my favorite things that I have setup.
I just installed them through docker and winged it from there. It seems like their wiki has a good in-depth guide. https://wiki.servarr.com/