heres the deal, i have an s-10, which by all means isnt fast but i do get above 80 on the freeway. anyways, i cant mount it way high like recommended on here becasue of the way the rear view mirror is. I can only mount low or semi-high (about 5 or so inches higher than low). Does high vs. low make all that much of difference? should i try and make high work? thanks.