The LI has divergence of 5.5degrees up and down (11 total), and 12.5degrees left to right (25 total). Lets assume there is one head on the front of the car, and it gets hit with a laser shot from 2000 feet out.
At that range, and with the stated bean divergence, using simple geometry and trig the sensor is going create a "null zone" where jamming will take place that is 385' tall, by 886' wide. Obviously, the LI isn't working at full power for the full range of operation listed. So, lets assume that it is effective for half of the listed range. This makes a "null zone" of 192' tall by 443' wide. Even if we halve that, we get 96' tall by 221.5' wide. Yes, half of the 96 (or most of it) will be directed towards the ground), so half of 96 will be effective. This is 48', which is still plenty to reach the top of an overpass.
Surely, this is a large enough area to jam a gun that is in the median, on the berm, or on an overpass, right??
Obviously, two sensors will pick up a laser shot better than one, but it seems as if only one transmitter is needed for either the front, or rear. Does this make sense, or am I on crack?
Here is the simple math and geometery I used.