I recently visited the newest and grandest grocery store in the area, 130,000 sq/ft.... My wife shopped and I pushed the cart all while looking up and taking a critical view of all the cameras and their locations.
My comments are plenty.
Aisle length and widths and rack heights/widths are important to know...
I would prefer cameras operate in 9x16 (or corridor mode) (not wide mode)
so as not to waste so many pixels on top of the racks and overshoots into adjacent aisles.
The image below is a typical 16x9 1080P wide view... vs. rotating that 90 degrees and going tall narrow... This applies regardless of the default Horizontal angle of view......
Do you place these at opposing ends?
or Perhaps near midway with opposing views? minimal overlay...
Interesting things include PIR detectors at the lanes....for management to see the need to open more lanes, Of course integration with the POS system is important....
Hanging from threaded Pipe (open ceilings)
Drop ceiling mounts.. older stores......
Find an integrator to embrace, pay them for a proof of concept....
and lean on them for the long term....
Cheers - Andy