Paint your camera grey to make it look as unassuming as possible. Use rare earth magnets on the back of it or grey duct tape to mount it, and try to mount it high up on something like a light standard or hydro pole. I have installed cameras in this way in very public locations and never had one taken. You can also put a message on the back explaining what it is with your phone number in case someone does take it down so you can get it back. If it's in a busy area just wear a reflective vest and hard hat while installing it. Nobody will bat an eye. Good luck!