Good points about your original locations pointing towards garage door to capture faces.
Hmmm...
If the job of these 2 cameras are for facial ID, then you are correct with your original placements. I have 2 camera's ( 2 x 8MP) dead center top & bottom facing each other more so for my wood working shop recordings as primary, secondary would be to see what someone is doing in my garage. My primary facial ID camera's are outside.
I mean..if someone is already inside your house/garage... it's now your home alarm system's turn, not facial ID camera's.
Now that I understand what you are trying to accomplish and re-looking at your map, I would give a thumbs up for your original locations pointing towards the garage door. You will get full coverage of inside garage and get facial ID's. Your stairwell arrow confused me as I thought that was your main viewing angle
However, the stairwell cam I would put more on between the corner in the center as you would be pointing directly at garage door without the side wall backsplash. Where you have it now, you will have to angle the camera outwards away from wall to avoid IR splash on wall for night stuff.