How To Know The Best Height For My Camera ?

As discussed in course ,we know how to measure and determine my FoV and best lens lengths based on my installation requirements but didn't mention the best height to put my camera in order to receive the best output .

See: Testing Camera Height vs Image Quality

Assuming the subject is relatively close to the camera (less than 10' away), the best height for image quality is low, close to the person's head, say ~2 meters high or so.

The big tradeoff is vandalism. That's the most common reason for people mounting cameras 5 meters or higher, as it makes vandalism much harder though results in typically poor faceshots with heavy downtilts.