In my Meshify I have my 3 blowing from the front, the top front is an intake as well, but is positioned in front of the cpu fan, and is also there to keep the air from the fronts in the case rather than being pulled right out before it touches the cpu. The top rear is an exhaust and the rear is also an exhaust, as normal. For me it works well. I also have a psychotic 92x34 3900rpm screamer on a controller running just under 1800rpm under my 980 pushing out of the pci area. That little fan at full chuff puts my TY-143 to shame lol.
3770K @ 4700MHz 1.35v/Thermalright True Spirit 140 Power TY-143 Push/Pull
ASRock Z77 OC Formula|8GB G.Skill Mix @ 1100MHz 9-11-9-28-2T 1.68v
EVGA GTX 980 Classified 3988 @ 1497/2001|Intel 545S 256 Striped
CM Silent Pro M2 850|Fractal Define R4/5x 120x38 1x 92x38|ZM-MFC2