I have a separate radarr for anime because there's are anime specific trackers that are much better for downloading anime, especially if you are looking for non-English subs, but radarr doesn't have a way to pick a specific tracker to download a particular series from. So my anime radarr instance only has those specific trackers on it so it will download from them everytime.

Which non-English subs do you look for? I try to look for Chinese subs and it’s been a struggle to find good tracker.

What might be easier than a whole separate Chinese tracker, Plex at least has a pretty robust feature where you can have it automatically find and download subtitles in whatever language you set. Only problem there is sometimes the timing is a little off with the actual video so the subs don't pop up at the right time, but you can change the offset with just a few clicks until it's right and then usually it's the same for every episode going forward.

If you're not using Plex or find it doesn't work so well for Chinese subs, can also try bazarr which does the same thing with subs but is a standalone software.

So with the above setup you can download the actual series from wherever and then it'll fetch Chinese subs for you and add them automatically. Otherwise for actual Chinese trackers try share.dmhy.org and mikanani.me for public trackers.

Feel free to shoot me an email(in my profile) if you need any advice or help setting anything up :)