FWIW, a Mac mini server is a regular mini with two 2.5" hard drives (not hot-swappable or even user accessible) and a token to download Server.app from the App

FWIW, a Mac mini server is a regular mini with two 2.5" hard drives (not hot-swappable or even user accessible) and a token to download Server.app from the App Store. Apple can't even be bothered to list a rack mount kit or 220V PDU-compatible power cable in their store. That said, they work well enough.