Yes, the two outers are purely for rear Poliscan protection.
I did however, draw it out in AutoCad fully scaled to ensure there were no gaps in the coverage, particularly in the rear when shot from behind at 10m (33') from a typical rear Poliscan setup shooting from the verge at 35deg (imported and scaled from Google Earth). Beyond about 10m, I should have some degree of overlapping protection from the rear heads due to the beam divergence.
10 deg out on the front is about the maximum, otherwise you open up a small channel of non-coverage at 0 deg straight ahead in front of the licence plate (depends on the size of the car and mounting positions of course)
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