How many times we got to go over this..?
'Ground/bumper cam' is actually cockpit cam with an invisible car. There have been thread after thread with visual PROOF that the height of 'bumper cam' is identical to cockpit view.
There is NO 'hood cam' That is 'roof cam' as it sits JUST on top of your roof, higher than eye level and a PROPER 'hood cam' would.
And, if any of you need more proof of all this, simply drive your car in 'bumper cam' right up to another car until it touches. If it IS a 'bumper cam', all you would see is the other car's bumper. Most cars, you are looking in the back window. QED...