tilting it down will prevent it reflecting back to the Lidar
4Door, give your local police shop a call and ask them exactly how the camera system works. I've actually used the unit you're talking about. The laser is trained on the car, not the number plate. If the car is deemed to be speeding, then two photos are taken of the car: one from a distance and one zoomed in on the number plate.
Tilting your number plate will make absolutely no difference. Do you have any idea how hard it would be to train a laser on a number plate?????? At 250m, movement of one thousandth of an inch will jump the laser beam about 1.5 metres. That's on a stationary object. Are you even thinking about what you're writing???
As for speeding, I don't deny that I may have exceeded the speed limit at times. I'm certainly no angel on the roads. But I'm not the one trying to get out of being tagged by the camera, and the things you're talking about won't work. Fine, speed if you want to. But don't then grizzle about the consequences of breaking the law.
We wonder why our insurance premia are so high, and why imports have such a bad reputation with the police. This thread is exactly why.