It is crucial that the device is place in front of the driver, since the viewing angle of the projection is very narrow. Another importang thing is that the device lens should be open straight at 90°.
Make sure that you have enough space on your dashboard and the distance between your dash and the windshield is no less than indicated below.
Click here to download and print the drawing of the device. Then cut out the shape and fold as indicated on the mockup. After that place it on the dash to see if there's enough space for the lens.