Kenu Airframe, which has been on the market for more than a year, seems to offer a pretty good solution in mounting a smartphone in a car. Kenu Airframe attaches smartphone on to the car air vent. It is compact and takes little space.
There are concerns with heat and moistures when mounting a smartphone on the car air vent. with that in mind, probably it is not a good idea to mount any electronics on the car air vent when the heater is on.
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