I’m set up in containers on Linux, but there should be a config file you point to both lidarr and slskd. You’ll need the api key for each for them to connect, and in each you need them pointing to the same download location.

Soularr works pretty well in conjunction with slskd. If you know how to use soulseek, it shouldn’t be too hard to get set up. The interface is quite different from the other *arrs, but it was easy enough to set up for me.