Tim, i have tested the same setup. It was not very difficult setting it up. The Mac mini I use is a 2012 version i7 with SSD. It runs Roon core and further less as possible. The advantage of the DAC of your choice is that it runs 32 bits formats too. However you will find the format rarely. Later I switched to a PS Audio DSD DAC which I found more spatious and round in sound. Take into account that choosing the right interlinks and USB cable should not be underestimated. In the end I had Audioquest Earth interlinks and Coffee USB. Now I changed all for a Devialet Expert Pro 250 which has it all no need for a separate DAC. Have you considered a setup with a QNAP NAS which runs Roon core also? No need for a Mac mini. I have two cores now one on the QNAP and one on the Mac mini. I can run both simultaneously both with the same audiophile quality.
Philip