I managed to implement Spotify Connect on my Max2Play Raspberry Pi + HifiBerry following this instruction: https://www.youtube.com/watch?v=qqMzXmvW4T8
The only problem is that both try to use the same output device, I get an error when I try to start Squeezelight:
[10:35:50.562781] test_open:294 playback open error: Invalid argument
[10:35:50.563179] output_init_common:381 unable to open output device
Maybe a solution to switch between players sharing the same output device (similar to MultiShairport) is possible?