Where is the best place to install the car phone holder?

Where is the best place to install the car phone holder?

The installation position of the car phone holder is as follows:
Center console instrument panel: This is a relatively conventional installation position, and sometimes it is easy to block the line of sight.
The air outlet of the air conditioner: place a car phone holder at the air outlet of the air conditioner. Generally, the blades of the air outlet are required to be horizontal. The air outlet blades of some models are vertical or round, which are not suitable for placing a car phone holder at the air outlet of the air conditioner. 
Front window glass: The portable navigator is installed here. When installing, just use a car phone holder with a strong pressure suction cup base to stick it on. It can be removed and put in the glove box when not in use. 
The position on the left side near the A-pillar: the advantage of installing here is that it will not block the line of sight, and it is more convenient to see the navigation.
Below the rearview mirror: Few people install it in this place, because such installation may cause the rearview mirror to shake when driving, which is a design defect.
Cigarette lighter plug-in: Some cars may not be able to use it, because the armrest may block it.
Others: For example, other positions such as the left side of the windshield.