We recommend that the detector have a clear view of the road both front and rear. Avoid placing behind the tinting at the top of most windows, behind parking stickers, wiper blades, or anything similar that will obstruct the detector's window or lens.  This is exactly why we no longer include the visor mount with the detectors. Most cars have tinting that will reduce the laser detection range in front of the visor section of the windshield. We also advise placing the detector where it will not obstruct your view of the road.