Proxmox wants 3 for a quorum, I'm considering throwing Proxmox on a rPi
to give me 3 nodes.
It's been a while since I did this, but back when I did you didn't need Proxmox on the rPi, you could just install a daemon that would do the trick.
A quick Google suggests QDevice is the thing to search for.
This was back when I had two R620's running Proxmox here at home. The power bill put an end to that and I ended up moving those two servers to a local datacentre (a previous employer let me use some unused space in their rack) and added a 3rd, so I had a quorum anyway. These days I have just a single Proxmox server back at home, so don't currently have a need...
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