Be aware that when you use AirPlay2 on an iPhone or iPad, the Apple Music app will down-sample the stream to a very lossy 256kbps (versus 1,411 kbps for 16/44.1 CD quality). This is a function of the Apple Music app and has nothing to do with the Node. According to Bluesound tech, if you stream from a MacBook Pro, you can get 16/44.1, but not from an iPhone or iPad.
I didn't know this when I first tried Apple Music via AirPlay2, and I couldn't understand why it sounded so bad on my system. I normally stream Tidal, Qobuz and FLAC files from a NAS drive and the difference is very noticeable. You can find discussions on this on the Bluesound support pages, What HiFi, and John Darko's web site.