I posted a video from one of my cameras a couple months ago, where a buck stopped, stared at the camera for several seconds, then backed up a little, and went off the main trail and around the camera.
I have a white flash camera at the same location, and it's been there for several months. The flash from that camera doesn't bother the deer or elk. But the IR cam in video mode sure did.
It was right at eye level with the buck and facing right up the trail, so he was walking direcly at it. I could see where placing cameras higher would be very beneficial for that reason. Not only that, they would be much less likely to get stolen.