If you have a case on your phone or dont mind sticking a piece of metal on it, i would suggest this
https://www.amazon.com/WizGear-Unive...tic+phone+clip
Its very nice and keeps the phone on snug at the perfect location when clipped on the passenger vent, bottom row.
I simply placed the metal sheet thats included under my cover (did not stick it on) and its holds my LG G4 snug and has never fallen off.