180gal tank overflow where to drill

Hi guys, I am planning to order a new 180 gal tank, however they said they would have to overflows in the corners drilled at the bottom. But I am planning to have my sump setup on the other side of the wall (not below the tank). Sump will probably start somewhere in the middle of the tank level. So should I ask them to drill on the side instead ? as if they drill at the bottom the return pipe would have to go back up to reach the sump.