If Airplay supports UPnP DLNA, then this one is hard to beat with 10psec jitter at the end of the S/PDIF coax cable:
https://www.audiocircle.com/index.php?topic=156409.0
Supports up to 24/192 on S/PDIF coax and DSD on the I2S outputs (not tested yet).
Steve N.
Empirical Audio