It's an interesting approach. I did it a bit differently. I set up three Proxmox nodes on three hetzner servers. Then I deployed virtual routers. I then set up HAProxy and k3s nodes as LXC containers. What's nice about the whole setup is that a proxmox node can go down and it all still works. I will now set up keepalived as mentioned in the other reply so the HAProxies will also be fully HA. Proxmox also works well with zfs and backups. I set up the proxmox nodes manually and did the rest with terraform + ansible. One `terraform destroy` cleans up everything nicely. I wonder how the performance difference is between bare metal and k8s node in LXC.