When you purchase your cameras, they are going to come with mounting and possibly housing accessories. The mounting accessories are going to be the hardware that you will use to affix the camera to different locations. The housing is going to be the actual cover for your camera. You may want to find that water and weatherproof housing is what you really need. You can often find cameras that offer this. Those that are going to be outside most assuredly will.
If you find that you are going to have your camera in an unorthodox location, you might find that you need to have specialized mounting accessories or specialized housing. You can always look for other options