Havent seen this discussed too much so figured I would ask

I am building a vertical PJ obviously... and have the air in take in the front passing over the lcd then headed toward the back....

But should I put the fans on the back side toward the bottom or more toward the area where the intake would be? It would seem more efficient to place it higher to remove the heat that rises up, but then again I don't know that for sure.....

You ain't looked hard enough then. Cooling has been hashed over quite a bit over the years. Just pickin' on ya. In general, don't fight the natural tendency of heat to rise.