Hi, I have the Climair just for the front windows-maybe pricier than other makes but are brilliant.
No, they do not cause any bother with folding mirrors, not electric anyway. have had them on mine for a fwe years.
1 tip I will give, is make sure you have an extra pair of hands to help place. These are not held in by clips, but by pure pressure, hence the 4 hands as you have to bend to fit! You will think as you're bending to fit that you have somehow ordered the wrong size or for wrong car-you haven't-it just takes a bit of nerve to bend and fit! Once in, they ain't moving. Mine haven't.
Good luck with it.