Cell phone holder for vent?
 

I'm looking for a good cell phone holder that will hopefully attach to the vents on my T&C. Since the outer slats are vertical, all of the ones that I've tried do not work. They would be fine on the outer vents (by the windows), but I really need it in the center to my charger cable will reach.

Anybody have anything that works? I'm willing to tinker and even build something if necessary. I don't want to attach it to the windshield or use one of those cup holder snake ones.