I've had a few Streamers over the last couple years and as much as everyone say's they make a huge difference that is not what I have found. here is what I've tried: Dedicated PC optimized for streaming music, Blue sound node first gen, Roon nucleus, Aurender A10, Chord Streamer ( 2go-2yu current). if I was honest the best sound was the dedicated PC optimized for streaming only. the rest were just slight and I mean very slight differences to the presentation/noise floor but none really any better over all. really IMO the DAC is a better place to spend the money specially if it has good isolation of the input signal ie USB galvanic isolation.
That said your using apple air play and that's not optimum so find a streamer you like the software for, that seems to be the overall deciding factor with streamer love-hate. other than fancy case's and nice looking hi end stuff they really do not perform leaps and bounds above cheaper options in my experience.