You can't quite use any DAC. I found this out the hard way. The DAC needs to be new enough to be driverless. I have an old W4S DAC-2 that was flagship and Stereophile recommended when it was new. Still not bad sounding but Roon won't see it since needs driver files installed on the streamer (back then it was a computer).
Otherwise, Roon should be fine with any DAC. It may not recognize some lesser known DACs and will call them something likely associated with their chipset.
Jerry