Proxmox is all I use for VM hosting, it is well worth it IMO, I colo metal and I host several virtual machines on it, webservers, ircds, kbin, etc. I specifically use Virtual Machines (KVM) however, it does have the ability to do containerization too (LXC).
yeah, I've been getting hammered in my transport queue from this. I guess if this is intentional it is worth just defederating to avoid spamming the queue and logs.