I have no personal experience with tint in cars, while it is legal in Denmark even to what ever tint level, it is only allowed on rear side windows and the rear window.
You can absolutely not have any aftermarket tint on windscreen or front doors.
You can also not lower or lift your car very much, we talk mm here, and you can not increase engine output very much, chip tuning ASO are not allowed, and a after market exhaust can only be 90 Db MAX even if you can buy a brand new Italian sports car that is +120 Db from the factory.
But most cameras have a +/- 2 EV steps, and i can not say i recall anyone thinking it was not enough, it would at least be better than nothing or having to cut a hole cuz even with the lens right up against the glass they are very wide angle and so you would actually have to cut a pretty large hole.
My rear cameras in a little JAP 5 door Hatch where the rear window is pretty much vertical, at night i can see reflections of oncoming cars headlights as they are about to pass by me.
This is a compilation of night plate capture with my vantrue, mind you using high beam angled down as much as i can, CUZ with the regular light my car do not throw light into oncoming lane more than a little in front of me, and a little bit more is needed.
So have to " cheat " with the high beams.
Do remember EU plates have much larger lettering then US plates, and of course no funny / silly secondary graphics on the plate.
This is also without a CPL filter as these actually also block a little light, i have a DIY dashmat in my little car as that is of course not made for a little marginal car not selling very much.
Do not look good, but then again i drive car to not walk or risk one of the too many fellow dumb ass Danes getting in my face in public transport.
You can always do a test in the car by just pulling rear camera and wire strait thru the cabin and then hold it up to the rear window, and then see what you get during daytime and night time, i would test with 0 EV change and +1 and +2 both night and day to gauge if one maybe overexposed in the daytime.
My little car have mirror come off roof and so nothing on the windscreen, so i can have 2 smaller cameras hidden in front of the mirror and not see it, and in the old days with single channel systems some times i have had a whopping 5 systems side by side on the windscreen.
But that is a cheap ass 2012 car, if you have a sensor island that take up much if not all of the optimal place ( high and center of windscreen ) you have to mount below it, some even mound the camera off the sensor housing for often pretty darn stealthy installs.
Or you can mount offset, usually to the passenger side, this als work but you do have to offset quite a bit to not have any of the sensor island in the footage.
As always nice to do tests with the camera held up to interesting places to see what look / feel best.
Offset to a side, due to windscreens being curved you will of course be filming a little sideways, but with the wide angle lenses in use, it is not like you be missing much.
I often do these tests even if i am quite sure where the system will go, i have a 3" or so wide dotted area on top of my windscreen and i prefer to mount on that so the lens peek out below, but i have at times been a little high and so with lens aimed correct with a 50/50 split at the horizon i have had a little of that dotted area in the footage.
But after well over a decade little things like that do not bother me
