Marco tells us that if you have 48 Mac minis, buy them yourself and rent a rack.
How does that work if you don't live near the colo?
Most colos provide remote hands - a recent ATP talks about it.
https://www.colocrossing.com/managed-service/remote-hands/
Become the Cloud.
https://appleinsider.com/articles/26/04/07/giant-mac-mini-cl...