Omgitstony you have stated the kernel of this discussion as succinctly as I have ever heard ‘camera coverage of cameras’. This concept is what I have been advocating among my relatives, friends, and neighbors. The implementation shown below for typical tract housing can be also used for larger more expansive homes.
In the picture below, ‘camera coverage of cameras’ is implemented. The cameras at the left corner is a double installation that view the front and side of the house with a 90-ish ° blind spot at the corner. This blind spot is covered by the right corner camera, the right camera’s blind spot is covered by the camera at the left corner of the front door. This front door camera has no blind spot.
The picture below is a closeup of the double camera installation, it is about as simple as it can get.
The third picture below shows some fabrication details for the double mount bracket.
The last picture below shows a triple camera mount that provides full 270° coverage at the corner of my house.
I hope the above shows how simple it can be for those with DIY skills.