Very much agree with camera height. It sounds pretty high if you are trying to 'ID' anyone. I would try to find a place that is lower. My camera for my front door is just under 7 feet and I still think it would be better at eye level (something like 5 to 6 feet). But for my location, any lower brings the very bright street into the frame and that ruins the exposure (under exposes the face), so I had to go with 7 feet and aimed down a bit. I would echo what others have indicated, buy a camera or two, get BI going and place the cameras in a temp fashion so you can see if those locations will work for you.
For me, a camera 5 meters up in the air would do no good for ID or anything else. But if you have a large lot and just want to know if something enters it, then it might work well for that.
I installed my two cameras facing my driveway at the 4 foot level and feel it works really well. Since they are facing the street directly there are no exposure issues (like on my porch which is covered) and when anyone approaches they catch faces really well. The drawback at such a low placement is that I don't want any alerts from someone in the street (I use zones to block off the street from alerts), so it becomes a pretty thin line of where I get my alerts from. Meaning that they have to walk a fifth of the way up my 22 foot driveway before I get an alert. So far I am happy. It works for me since once they are that close the cameras begin recording and I have very actionable clips. I will take clear/actionable images over not getting alerted the second they step off the sidewalk. I have three cameras on the front, two on the driveway and one on the front porch. Then three more for the back yard, two at 7 foot and one at 6 foot.
