the stupa is very effective against tanks, to give two examples, you can extract up to 60% of a jumbo with only one shot and kill the crusader in one shot ... not to mention that you can kill a whole peloton if you have luck, and you have a greater chance of this happening if that unit has already received damage, you can also immobilize armored units, for that reason, I think it is not a good idea that it to be in bk doc
And the grille is fine as it is now, at least it seems, if you are attentive you can evade their shots (you hear when the grille shoot, and you can even see it in the fog of war on some occasions, so you can imagine what unit is the objective )