Recently was looking for same feature (multi-room audio) and ended up buying IKEA SYMFONISK (basically sonos) speakers, that function without an issue. Only extra step is going to Sonos app to merge them and Spotify picks them up as one device , no questions asked.
So technically it should be rather easy, no latency issues at all.
Recently was looking for same feature (multi-room audio) and ended up buying IKEA SYMFONISK (basically sonos) speakers, that function without an issue. Only extra step is going to Sonos app to merge them and Spotify picks them up as one device , no questions asked. So technically it should be rather easy, no latency issues at all.