There’s no soulseek integration yet, but that would be a game changer, the collections in there are incredible, especially when trying to find EPs, singles and rarities. We’ve been waiting for a good long while though.
In the meantime, it’s a lot of work to build a collection, even with lidarr, torrents, semi-private, private trackers and usenet.
For soulseek, I’d recommend setting a blackhole torrent client that points to the soulseek download folder, them always make sure you download the folder not the files from the share. That will make importing the files a lot easier into lidarr if you choose to keep that as your centralized download tool.
There are also extended scripts for lidarr that will pull music from various sources as well.