Proxmox is more about the management of the hosts and resources on them, including the live migration of VMs between hosts, support for some types of HA and fai

Proxmox is more about the management of the hosts and resources on them, including the live migration of VMs between hosts, support for some types of HA and failover. You can likely manage the configuration of the VMs themselves through terraform or similar in combination with Proxmox if that's your desire.