In message , MrCheerful
writes

Stick it on when the car and windscreen are nice and warm after a run.

Out of your eyeline and high, left of the mirror and in a swept area is
the most usual place. Run the lead up the pillar tucked behind the
cover.

My very cheapo ones are now relegated to security uses in various places
because of the difficulty of getting the memory card out without taking
the camera down.
I went upmarket to my £10 current one, which looks like the many called
"GT300", but admits to no name anywhere. It sits LHS behind the mirror
and I had to extend the cable to reach all the way round the screen and
across. It works really well apart from the scratched and pitted
windscreen sparkling in some sun positions, and the SD card is easy to
get out. I've ordered a much more expensive model for the other car and
will mount it in a similar place.
--
Bill