Mobile nav on the windshield?

Hello Volvo friends, after I had been opposed to the purchase of a navigation device for a long time, I decided to buy a mobile navigator. As a wearer of a reading goggles – I don’t need to drive – the navigator must not be placed too far away. Is a 4.3-inch device, if it is attached to the windscreen and the view should not be “too far” away from the XC90? Can it be reached from the driver’s seat without it from the holder has any of you mounted a mobile nav on the front window of the XC90 and can provide information about readability and usability? Greeting Dino2008