Since you seem to know what your talking about can I ask you one more question.
I got some people fooled
I dabble in CCTV, but I'm no expert. I just try to use some common sense and draw from past experience
The sun can always cause issues. You'll see that the effects will worsen then get better with the time of day as well as the time of year. I have locations where the sun comes in through windows, reflects off tile floors & other items (both indoor and outdoor) are terrible with some camera placements for certain periods throughout the day. Just need to play around with sun sheilds & camera placement to prevent the rays from beaming into the lens. Camera quality has alot to do with it also.
Where to place cameras all depends on the location, environment and what you're trying to capture. I can't give a direct answer to that question.