On Monday, 21 November 2016 14:06:43 UTC, Dave Plowman (News) wrote:
Drill a hole in one of the cutouts on the back of the box. Screw in a self
tapper. Pull out the cutout. Drill hole through wall.

I can drill a hole elsewhere, but the annoyance factor is I could have done the plastering in one go rather than two.

Owain