Review on Car Rear Window Sunshade Protection by Daniel Postle

The position of the suction cups and the shape of the rear window can determine how well this sun visor suits you. There are only two suction cups, and they're on opposite ends of the screen but in the middle of the shorter sides. If your windshield is tilted at a slight angle, the shadow on the glass will be along the bottom edge. This can create a large gap along the top edge. Installing four suction cups, one in each corner, solves this problem and makes the product more suitable for all window shapes and sizes. With all this, the suction cups hold well and the transparency is sufficient.