Strips can be mounted almost anywhere. A clean and relatively flat surface is the best place to mount it to ensure it will remain in place for its lifetime. When mounting on a window or door, it’s up to you where you place it as long as the sensor can detect the magnet when it is in the closed position. Sensative recommends that the sensor be placed on the fixed part of the window or door whenever possible and the magnet placed on the movable part. This will protect Strips from unnecessary movement and exposure to the elements.