Very similar to my setup as well. I have a Qotom with 5x2.5Gb NICs. It’s got a lower end processor - Intel Celeron J4125 but I haven’t noticed any performance issues with my 1.5Gb connection.
I’ve got my proxmox cluster and my workstation on one interface with a 2.5Gb unmanaged switch, and then on another interface a Unifi 8 Lite PoE switch with 2 Unifi AP’s where all the streaming devices, wife’s and kids devices live.
I rented this game so much as a kid but never made it past Threed. I never cared and just loved roaming around. It wasn’t until years later, just a few years ago now that I finally completed it start to finish and got to see how much more bonkers it got.