Installing security camera outdoors
There are some common spots for an outdoor security camera, soffit, overhang, upper wall. Yes, it's important to watch out for the hidden cables or wires hidden buried in the wall. Here is a useful guide that you could look into when you are installing the camera outside https://www.securitycameraking.com/securityinfo/cctv-installation-and-wiring-options/

For outdoor mounting, secure the camera by using screws are common and useful.