The gun turrets would be mounted in I am thinking probably some kind of massive high-security armoured & reinforced concrete sloping at a pyramid-type-of-angle type bunkers / towers.

Maybe something like this, only not with a sharp top but a gun turret on top.



The idea of gun towers is to give the gunner a good view of the desert terrain which is unlikely to be completely flat and dips in the ground could otherwise provide cover for attacking mortar teams. Gun towers also enable the gunners easily to see over and beyond any obstacles in the vehicle barrier into the Threat Zone. The gun towers should be robust enough so that they could take a number of artillery shells without collapsing.