All good questions!
Re blossom servers - this considered to be default place to store media on Nostr. You can add other Nostr media servers or if you have your music hosted somewhere just paste the link to the track which is probably more self soverereign.
Yes, RSS generation is necessary for this reasons. I did't want to turn it on and inject to aggregators by default cause people might have it elseswhere so people should be careful. Afaik the usual place to post your feed is https://podcastindex.org/
I'm working on adding management for multiple artists so stay tuned for this! It's coming soon (hopefully tomorrow).
Afaik Fountain is using Podcasting 2.0 so it requires RSS which is generated by Wavlake. If you switch from wavlake you can get your RSS adn submit. I notice though it takes ages for Fountain to index RSS so better be carfeul here.
Tsunami (or Sunami as I'm thinking to brand it) work on Nostr Music.
You can check out https://zaptrax.app/ by nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqy08wumn8ghj7mn0wd68yttjv4kxz7fwv3jhyettwfhhxuewd4jsqgplwuxkt5a8vj5utj6s8tsj8e3wcavc45p4mqmw92qs7wrh5azmys9f0hy6 and nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqy8hwumn8ghj7mn0wd68ytnddaksqgqmcu9qzj9n7vtd5vl78jyly037wxkyl7vcqflvwy4eqhxjfa4yzyr2p7gd https://nodecast.xyz/ so you can see how other apps implemented. As with Nostr you should be free to choose what platform you use. I quite like nodecast for posting music and taking some inspiration there.