[ENHANCEMENT] - Show multiple GPUs on dashboard

[luckolen]

Is your feature request related to a problem? Please describe.
I've two GPUs in my unraid server (one for Plex transcoding and one will be linked to a VM. I'd like to see the statistics for both, but I can only select one of the two GPUs in the settings.

Describe the solution you'd like
Allow the option to display all connected GPUs

Describe alternatives you've considered
I haven't found any other software which does have this feature

Additional context

[SimonFair]

@luckolen is your GPU bound to vfio for the VM. You will not be able to see stats in GPU Stat for GPUs allocationed to a VM.