Honestly multiseat is not really the easiest solution in this case. Install proxmox with two VMs
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Are there any guides for doing this? I can't seem to find any, and I have zero experience with Proxmox
Yes, you can just look up proxmox virtio GPU pass though
It would be if it wasn't for NVIDIA, as usual. On Intel/AMD, you assign the seats, the displays light up and you're good to go, pretty much works out of the box, especially on Wayland.
But for NVIDIA yeah maybe a VM is less pain since NVIDIA works well with VFIO.
Not sure if it'll solve the issue but you could try docker/podman with x11docker to separate the 2 instances (ie only allow them to see 1 gpu/peripherals), cause it seems like theyre stepping on each others toes rn
I've never tried to run multiseat the way you do here.
I do however succesfully run multiple computers in one chassi using kvm/qemu with pci-e physical passthrough on gpu and usb controller to my virtual fedora gaming machine (using vfio drivers in the host). Definitely more overhead than multiseat but I do enjoy the easy backup and restore I have on my gaming machine.
Level1techs.com has a ton of good information if you're interested in virtualizing instead, such as https://forum.level1techs.com/t/ubuntu-17-04-vfio-pcie-passthrough-kernel-update-4-14-rc1/119639