My experiments were using AirPlay. I haven’t tried with RAAT but generally speaking I think any wireless connection in the audio path should be unidirectional.
If you’d like to keep your MacBook wireless, I’d suggest RoonServer as Core on a server computer (I use a BRIX) with the library on an onboard SSD (depending on size) wired to the router and leave your Aries and MacBook wireless. The MacBook will be a remote and audio path doesn’t go through a remote unless to a private zone on that remote.
There are architecture documents in preparation. My most recent attempt at explanation was in this thread.