I go with Mac for most of what he says, in fact all, not most.
However as well as my own computer experience, my employment meant working on electronics control cabinets for CNC controlled machinery, most of them used a fan in at a low level with a fan out at both an upper level and the other end of the case. That of course resulted in an even flow of cooling air from the lower level covering most of the electronics, with the upper fan working on the principle that warm or hot air rises as it travels the length of the case or cabinet.
I reckon that if that general principle can be followed, you can't go far wrong.