I use navidrome with bobob and it works great!

bonob acts as a media libary bridge so sonos can use navidrome as a media library (instead of having to use a janky old version of smb auth that sonos requires)

i use navidrome but no folder view, so mixtapes with many artist is counted like many albums

Just tag the tracks of you mixtape with "compilation=true": https://www.navidrome.org/docs/faq/#i-have-an-album-with-tra...

maybe you could try https://github.com/sentriz/gonic (nightly build)

it supports browsing by folder