Ok, but think of this. 3 woofers face forward, one down. When there is a drum strike, say a bass drum pedal, you will have a wave from the front and one that is centered 5" behind that. The downward wave will travel to the floor, be reflected then come to your ear out of phase with the other front.
This assumes all three forward facing woofers have the exact, same transient response. Which they probably won't.
Just my opinion.