Installing from zip would have been easier.
I expect that synchronizing playback time will be tricky, if not impossible, with librespot.
Nevertheless, I will have a look at what others do, eg Volumio.
I think synchronizing playback time is not a high-priority, but if it can be done, even better. Then those who like to listen to music while TV is turned on can see nice information, and even lyrics for karaoke:) None of these are important for me, and as kaibenn also said, 99% use Librespot with TV turned OFF. The important thing is that ALSA works perfectly, and TVHeadend zapping is fixed. Great work!