I’ve run Proxmox on it, but it was overly complex and overkill for my use case.

Right now the host OS is Windows Server running VMware Workstation. Pihole runs in a VM (DietPi), which auto starts on reboot. Fast setup, runs as my DC, VM’s as needed with enough performance (though not as much as I’d like for my virtualization goals).

Next box will be my own build since this one is limited on space.