If you ever need a large bunch of Mac minis in a data center, then start reading at [Wayback/Archive] GitHub – Uptime-Lab/KVM-rack-stand-for-16-Mac-minis.
The repository by Ivan Kuleshov has all information you need, including scripts for Pi-KVM, and 3D printing STL source files.
It was covered in [Wayback/Archive] The MagPi issue 139 — The MagPi magazine (direct [Wayback/Archive] MagPi139.pdf; it’s too large for [Wayback] Goole Docs on-line viewing).