I'm not too familiar with roon. As for proper metadata, I've not had any problems with MusicBrainz's metadata grabber. It's a built-in plugin that comes with Jellyfin. Deemix uses your deezer account, which I believe requires the paid version if you want lossless flac files, and I have it configured to place the files in my Media share, which Jellyfin reads from. Symfonium is the android client I use that works with selfhosted media servers.