Avoid glare on facade/architectural lighting
I have devised a solution that doesn't involve creating a "snout" that is attached to the light source themselves: the issue will always be that any attached plate will reflect light at the angle of incidence , and that light will mostly be reflected in the direction the second plate tries to block, and this is a suboptimal solution.

What I realized, however, is that a plate that is disconnected from the light source itself, either via metal rods or attached to the ground some other place, can be positioned as a direct barrier in the path of the unwanted light, and any reflection will be back towards the light itself.