Something that I don't believe has been mentioned by anyone yet, but what of a dockerless installation in a production or evaluation environment, for reason that the environment itself is fenced (LXC)? Proxmox does not guarantee support for nested containers, the current 9.x version of Proxmox that supports docker emulation is still a immature feature, and this software does not necessitate an entirely separate hypervisor and VM stack just to run docker containers