Asking because in my testing of that in Proxmox 3 and 5 node clusters last month, the live migration would fail (aka just hang with no further progress) just over 20% of the time.

Haven't looked into it further (likely will though), but searching around online shows lots of other people having experienced the same issue. General sentiment seems to be "Proxmox is good for homelab and non-prod environments. But probably don't use it in production."