Mortars from Enemy Spawn

So Mortars, The things that can be very vexing but there are ways to take them out.  Hunting them down on foot, sniping them, using a drone,  but if they are in the very rear of their spawn the only thing that can deal with them is counter fire from another mortar, but it has to be right in the thick of the fighting in order to reach them with their fire while the other mortar is completely risk free.  Just wondering if this is working as intended or is there maybe something in the works like limiting mortar placement to half of the spawn closest to the enemy or something.