if you actually want the best possible server for Roon core, then that would be the Taiko Audio SGM Extreme. it’s a 100 pound beast.https://taikoaudio.com/taiko-2020/product/sgm-extreme-high-end-music-server/
you will wait 6 weeks for it (there is a line of people waiting for theirs). then when it arrives the Taiko team will Team Viewer into your network and optimize it for you.
once it’s set up likely you will upgrade to their new music management system TAS, a Roon alternative with higher performance than Roon. you will be able to toggle back and forth between Roon and TAS and decide for yourself which way to go.
this is if you actually do want the very best server for Roon.
as far as the rest of my set-up; you can view my system page; my digital path is the SGM Extreme server -> MSB Pro USB -> MSB Select II with dual power supplies. i also have a pair of mirroring NAS's as back up for my files; my files also reside on the Extreme server in PCIe solid state drives.