You want flow, not flood. 3x 120mm intake on bottom with 3x exhaust on top, chimney style, gives great flow, straight up.
Could also use a more standard approach, using 3x intake on the backside, 120mm rear and 120mm top-rear, which will give a more standard flow.
I'd not maximize fan usage, that creates circular flood patterns not flow patterns, and while air will move, it'll have less effect on actual heat. For instance a top-front exhaust placed directly above the top backside intake will do nothing, air comes on, sucked right back out, doesn't grab any heat at all, just makes noise.