The more I think on this, the more I wonder if it’s truly unpopular “here,” but it certainly is in public.
Headlights should be no more than 2 feet off the ground. Yes, your SUV will look dumb. No, you won’t be able to see as far. But you also won’t be blinding everyone.
And no, adjusting angles does not solve this for monster trucks in the US.
I suspect the signs work in a range of angles and it would be fine with headlights and drivers at various positions, but yeah it should be considered.