Don’t they also have a directed ‘sound’ cannon/dish that can cause immediate incapacitation?
Sure that will work ... once, but until they are a serious response they will keep on coming in ever larger numbers ... That is only for crowd control at best, but of no use against an organized regiment of irregular invaders charging ...
Need a hundred or more if these. Mount some on a few military grade dirigible or blimp platforms for look down targets. Imagine the Goodyear Blimp patrolling a border sector firing off these...