Honestly, my first thought was "does the datacentre know ?"

12 MacBooks per shelf, if we say roughly 5U per shelf (21.12/4.445 rounded up), so roughly 9 shelves per 47U rack, so 100-ish MacBooks per rack.

That's a scary density of LiPo battery.

The author complains about the lack of redundant power in Mac Minis, but there are other ways to get redundant power into one AC input.