So now that we have a more detailed and realistic explosives and shrapnel mechanics, I was thinking Claymore mine should be a thing. You could place it and then point the direction of shrapnel to be bursted, the same way you do when installing a headlight to your car.
Can be activated either remotely via a special RC trigger, or just work as other traps on a step or a proximity.
Sorry if that is already a thing, never found one yet.