Although I agree that cameras mounted high reduce how often deer notice and possible avoid a camera, the "high mount pointed doward" set-up has real downsides. This set-up produces a "spot on the ground" camera trigger area. Too often, I get pictures of deer--often critical pictures--that are off in the background. The deer would not have walked through the spot on the ground trigger area, hence the downward angle set-up would have missed that deer.
To reduce camera avoidance, I use black-flash cameras positioned low. I'm sure this set-up produce some camera avoidance, but moving cameras frequently will help with that problem.