I would try to have the port down firing but then you would have to add some sort of legs to give the port clearance. I also read somewhere that a down firing port can also minimize port related noises.
Mike makes good point about watching that nothing get dropped down the port if you place it on top. If you are going to have it on top I would really recommend some sort of grill to protect from anything falling in.
Mike makes good point about watching that nothing get dropped down the port if you place it on top. If you are going to have it on top I would really recommend some sort of grill to protect from anything falling in.