Not trying to speak for Joel, but I’m pretty sure he read, and understood. He was making the point that if you drill, in advance of testing the location, you are sure to end up being disappointed, with a couple of holes in a useless place.
Most everyone who posts in this forum with an issue has done little to no effective testing, and ends up complaining about poor performance.
Joel’s point was, much better to tape it up for a couple of days, be sure it operates, as expected, in that particular location, rather than put holes there first, and find out it doesn’t work properly in that spot.
Viewing angle, sensor orientation, signal strengths from router and sync module, items in view of the sensor for false triggers, all have to be considered and tested to be sure of a successful deployment, before you drill any permanent holes in brickwork.
And of course, as you mentioned, it is all now moot, since the OP wanted an answer that day.