I bought this to make a Raspberry Pi webcam using the "Motion" software package. The camera is just the right size for the RPi board and camera. Just take the screws out of the end caps to open and remove the fake LEDs from the front piece. The front has a piece of glass (not plastic) so it doesn't introduce any distortion to the image. I used sticky velcro to fasten the camera to the inside of the glass. Very good solution for RPi camera.
I bought 6 of these and mounted under the roof eves, and after 6 months they all still look like new. Don't bother to put batteries in since real cameras don't have flashing lights. So if used as I suggest, absolutely weatherproof.
The camera is not a camera. It looks like a camera, but it's fake. Mount high on a building or wall so no one can access it, and those who don't know will think they're being watched by the camera. It works. It looks very very real.
It's a matter of preference. Whatever will give you more sense of security, go for it. I decided not to activate it. It saves me the time and the effort of replacing the batteries. From where I have set them up, it also will not put me at risk of being caught putting batteries in what is supposed to be an authentic camera.
You probably could but it may need to be leaning against something to stay in position. The "camera" portion does pivot on a ball joint so you could experiment around. At worst, maybe double-sided sticky tape on the mounting bracket part would work.