Only 2 of the 4 AC2 can be at hight mounted hardpoint. If you prefer shooting big target at 1000m it's better to put LB2X. If you have a soul of sniper, put the AC2. Fire in the same groupe, the 2 LLas and the ERML in the head. It synergis with the 2 AC at the top. If you fire only with balistic weapon, you are quite heat neutral.