I got an enterprise class 19" short depth chassis, whit supermicro motherboard and a xeon D (they are soldered to motherboard) whit 8 cores at 2.something GHz, multithreading and so on. Bought a 128GB ecc ram kit and a pair of intel enterprise 1TB ssds. Installed proxmox, whit mirrored discs, and it's now running 8 containers and 3 vms. Really low power consumption, just a bit loud but perfect for the garage. Placed inside an ikea lack table and mounted up above a door. Avoid buying consumaer class ssds as they are gonna last you only a few months in a configuration like this (that comes from experience, 20% wear in 6 months whit the initial Kingston I bought)