The best position to anchor your phone mount on your car should be at the furthest corner of your screen. It should be slightly above your wheel. Also, ensure that it doesn’t obscure the visibility of the road ahead.
Additionally, make sure that the phone mount has stuck to the screen properly before beginning the journey. This will eliminate the chances of it coming off when driving.
It is not advisable to put your phone at the center of the screen. This destructs you from concentrating on the road. It is also difficult to interact with your phone in this position.
Many countries do not allow windscreen phone mounts, It is good to first check with your country’s traffic regulations before affixing it to the screen.