

I just read the manual for the Euro version; basically, they assume you take the power strip/PDU with the computer.
So, you plug the special UPS into a spare outlet on the PDU; it monitors the power supply, and as soon as power from the PDU drops it jumps in and starts supplying. So plug into an outlet, then unplug the PDU from power, and the UPS takes over. Since at this point the pins on the PDU plug are live, they provide a safety cap to put over the end of the cable. The computer itself is never unplugged.
That hasn’t been true since 2018. (And in my experience (about a decade working at Sky), not that you’ll believe me, there was practically zero influence when it was - not least because James Murdoch had very different views to his father.)