When I was teaching learners regularly, with lessons in the dark evenings, despite the Corsa having two reversing lights, they were quite high up.
I mounted an additional reversing light under the bumper, to shine out the left rear corner behind the wheel. this lit the kerb well, for that wonderful reverse around a corner exercise. Lamp was not visible from behind the car, unless lit.
Specific purpose, but something similar could be used for other situations.