My camera has a built-in laser that marks the center of the picture.

Sometimes I have to adjust the camera depending on the location. If Im on flat ground, then I set the camera about waist high, but if I want to take pictures looking down a hill, I put a stick behind the camera to angle it down. Ill also place the camera lower to the ground depending on how sloped the hill is, and how far away the deer trail/feeder is.