I have thought and thought about this.
I recall seeing one a while back that had pod lights on brackets...looked like backup lights off an old VW Bug that clipped to the bumper brackets.
Most have had the flush mount, single, under the license plate, as the drawings shows just below and slightly to the right of the bracket we seem to be looking for.
I'll have to look more closely next E I see (and I do run into them around here).
Funny....the JCNA Judging Guides for the 1, 1.5 and 2 series, at least, do not even MENTION reverse lights.....so, if you're removed them, they cannot judge your car on lack thereof, as they left them out of their guides!