Obviously the moset secure / straight forward way is to use Ultranet. But here you need dedicated gadgets by Behringer to do the submixes+outputs.
No reaper involved here (other sen recording, ...).
You could attach reaper via USB and do the mix via software and some audio equipment for the (additional) mix. You can't use two audio UISB interfaces with a PC at the same time, and of course USB is only short distance. Hence you would use a network audio system like Dante.
-Michael
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