Also, for homelabbing, there's a magic incantation that allows you to configure Proxmox away from the default High Availability cluster mode.
By default, the HA mode insists that all nodes are up or others won't come up, making this tweak (it may be contained in the OP scripts, I don't recall) allows you to retain many of the benefits of having Proxmox machines "connected", without requiring you treat them like a HA cluster.
In my case, I have a node I shutdown when it's not used, I use it for specific occasional tasks, and then I have nodes I want up all of the time.
With the non-HA tweaks, you can still do things like centrally manage, migrate VMs and containers between nodes etc, without the limitations of it wanting them all up and available all of the time.