I too have a proxmox server(running PFsense, Mint, tailscale, and NVR backup) and I did run docker with HA, but I found that the coral was iffy when it was passing through the proxmox to docker to HA. There were so many times my coral would stop working and I would have to restart docker to get it working. It became so frequent that I had a script to reset my docker at a certain time of day. I eventually went with a HP tiny PC setup and ran hasOS on baremetal. Haven't had a problem since.