Maybe this will end the ongoing BS about mounting consideration for 'extreme angle' shots.
The total beam divergence for the Osram SPL PL90_3 that the LI (and probably other diode jammers) uses is 11 (+/- 5.5) degrees vertical and 25 (+/- 12.5) degrees horizontal. At those angle, power output is half the peak. At twice that angle, the output is virtually zero:
P.S. The lens on the blinder also has a similar effect (wider coverage horizontally)
Therefore, if your jammer heads (or input and output diode locations) have +/- 11 degrees clearance vertically, and +/- 25 horizontally, there is no point in wanting extra clearance.
A vertical head will provide better overpass/underpass protection, and worse to the side protection, compared to a horizontal head.
It is extremely important to have your heads level, especially vertically.