The Indoor MotionViewer can be placed on a flat surface, about at least 6 feet (~2m) above ground level, to overlook an area of a room. They can also be placed flat on the surface of the wall with the camera being on top.
The Outdoor MotionViewer can be placed flat on the surface of a wall outside your home, to overlook an area of your property. Again, please take care to ensure that the camera is on top, and the device is about at least 6 feet (~2m) above ground level. These devices are weather-resistant, so you do not need to worry about placing them under the roof or any other overhanging enclosure.