I'm currently playing about with all this - trying to get the best out of my Zenith Mk3.
I've tried the Sotm ISOCAT7, basic fibre setup and NA Eno. Of the three the Eno is my favourite, though it's only a day old so hope to hear further improvement. Like others, I felt the fibre option sounded dynamic and detailed yet brittle. Impressive in the short term, but wearying to live with.
I'm happy where I am now with:
Netgear Orbi satellite (wifi backhaul) => AQ carbon => TP-Link 5-port switch with iFi iPower X => Eno streaming system => Zenith Mk3
So, unsure whether to sell off the Sotm.
Does anyone think I'll get any benefit from putting it between the Orbi and the TP-link switch, or perhaps between the switch and the Eno?