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If you are not using any HA feature and only put servers into the same cluster for ease of management.
You could use the same command but with a value of 1.
The reason quorum exist is to prevent any server to arbitrarily failover VMs when it believes the other node(s) is down and create a split brain situation.
But if that risk does not exist to begin with, so do the quorum.
I have 2 nodes and a raspberry pi as a qdevice.
I can still power off 1 node (so I have 1 node and an rpi) if I want to.
To avoid split brain, if a node can see the qdevice then it is part of the cluster. If it can't, then the node is in a degraded state.
Qdevices are only recommended in some scenarios, which I can't remember off the top of my head.
With 2 nodes, you can't set up CEPH cluster (well, I don't think you can).
But you can set up High Availability, and use ZFS snapshot replication on a 5 minute interval (so, if your VMs host goes down, the other host can start it with a potentially outdated snapshot).
This worked for my project as I could have a few stateless services that could bounce between nodes, and I had a postgres VM with streaming replication (postgres not ZFS) and failover. Which lead to a decently fault tolerant setup.
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You'll need a QDevice to keep consensus. That wiki article will cover how to set it up and some drawbacks to QDevices. You should be able to run it on a low-power device like a Pi to keep the cluster going.
AFAIK forcing it to a lower number is fine if you're not doing HA. I remember reading something along those lines on a forum, but I could be remembering wrong.
If you're not using Ceph or HA, then I don't think there would be any negative effects from not having all the servers in the cluster ready.
Oh good, I am not using any of those at least not at the moment.
I haven't tested this at all, it's just popped into my head, but, could you create a VM on one of the nodes and join that to the cluster?
If it does work, I wouldn't recommend it. But I'd be curious to see if that would work.
That leads to a chicken and egg situation. The Proxmox cluster can't turn on VM because the VM isn't on to be the third node in the cluster number :)