Use either proxmox or unraid. Don't stack.
They are both great in their own respects but you need to choose what works for you and your hardware.
Up until recently I liked unraid due to being able to use multiple disks with different capacities. You don't really have that freedom with proxmox.
Oh man, I was a bit worried. I paid for top dollar equipment for my rig and I would hate for my system to not sweat with a malnourished start menu.