i put mine on the rear window too, i was going for the stealth look..... but charcoal is like unnoticeable! thinking i shoulda gone silver or white..
i originally was gonna put it along the top of the rear window (where the black strip is) but i wanted it more noticeable so i put it lower over the 'heater' lines... hope it dont melt my sticker...
i also had issues with applying mine.. the stubborn thing just did not want to stick to the glass... subsequently i have some creases in the border..... dammit! once i get my missing "." i will post up pics!