Lately I've been using PVC boards I've purchased from Home Depot to install my outdoor cameras. I mount a piece of PVC to my house and then I mount the camera to a 2nd (smaller) piece of PVC. This allows me to swap out cameras quickly and easily by simply unscrewing one board mounted camera and replacing it with a 2nd board mounted camera, as shown below. The Home Depot PVC is inexpensive and weatherproof material which seems to work well...

