Hi Greg. I use a Mutec Ref 10 SE-120 reference clock to supply a 75 Ohm 10MHz clock signal to my dCS Vivaldi full-stack, with a second 75 Ohm output, to re-clock the EtherREGEN, via a Sablon Audio clock cable. The Mutec and router are also grounded to a 0 Ohm reference signal ground (Coherent Systems RTZ3).
Unsurprisingly, I also use a Sablon Audio 2020 USB cable, from Melco N1ZH/60 EX to Vivaldi USB input.