exaSound PlayPoint+e38 is Roon Ready–speaks RAAT natively, so no issues there.
Trinnov Altitude32 is Roon Ready–speaks RAAT natively, so no issues there.
Merging’s NADAC PLAYER has a NUC inside running Roon OS (so same software stack as ROCK) and it also speaks RAAT. You could target it from an external core, or just use the one built-in.
The “turnkey” qualites of ROCK/RoonOS are the main benefit. No forced software updates. No other stuff going on to get in the way. No user interface creating costs at runtime. RoonOS stuff (including ROCK) behaves like an appliance.