Pass through. I would suspect, since unraid’s MO is to be able to move your usb and drives to new computers without loss, then you could move everything over to the unraid VM in proxmox. You would need to install proxmox on a unused drive or partition, spin up an unraid vm with usb and pci controller for the hard drives as passthrough. However, this is my first time using unraid so heed and precautions needed.