I used to have an Unraid server with the whole *arr suite set up. It worked somewhat like this:
I say somewhat, because I'm not even sure. It worked for a while, but like you can probably imagine, much too often something broke. It was rare for the whole setup to keep working for longer than a week on end. My family would start complaining about Plex not working. I became a tech hotline. Then, a few weeks ago, my whole Unraid server seized to work and I gave up.
I now have a completely different setup. Stremio with debrid!
I don't think I can share the exact instructions for my new setup here, but...