Will the phone drop when the car is driving on a bumpy road?
Magnets are very strong. This phone mount keeps your phone very stable and not falling off even on bumpy roads.
With the Magnet on the back of my phone case will it work with my home wireless charger?
Yes I bought a qi charger and it works fine
Does this mount work on round vents?
sorry about that,it can not work on round vents
Will it cause damage to my car?
No, silicone pad again the fan blade,will not cause any damage.