"ROON is flakey" maybe a result of ROON updates and the CORE not being rebooted. Are you able to reboot the CORE? This is not as much of an issue these days as in the distant past.
I use a $500 DELL under my bed without a keyboard, mouse, or monitor attached. I just RDP into the machine in the rare times I need to reboot. Does your SSD have an OS?
My DELL is setup to start at 7AM and shutdown at 2:30AM every day. I have 3 of the Sonore OpticalRendu streamers hooked up to my DACs via USB. I use USB because they are the best connection on the 3 DACs I use.
This setup also uses PowerLine adapters to send the bits to various rooms in the house. System works flawlessly for about a decade now. I used to do some very complex ROON streaming with Convolution Filters, speaker balance adjustment, etc. I use a simpler system now but that complex setup ran fine on my super cheap and low powered DELL.
I can get away with using a noisy and cheap DELL because I use fibre just before the DAC with the OpticalRendu's. An ideal setup would be to have fibre input in the DACs, but the only DAC I owned that supported that was the Lumin X1 (now sold).