hint for you, if your car is lowered on the rear the light will ALWAYS be sky high because the screws for adjusting arent made for going that low.
for nct; what you do is adjust them horizontally, and for vertical use the manual pop up regulating thing to put them to the right height. dont touch them before nct...
ideally, like me, if you have a lazy eye kit you can lock them to that position to make sure tester wont flip em up or down.