In reply to a post by billford:

Something tells me it's intended to sit on a flat horizontal surface, and it seems fine that way. I've got mine on a shelf about 5' above floor level, over the iMac. It runs warm, but certainly not hot to the touch.

This would be upstairs with the cables coming in from the bottom. The LEDs wouldn't be visible anyway, since it would be in a ventilated cabinet towards an upstairs ceiling, in order to obtain the greatest wireless coverage. It might just fit horizontally, but vertically would allow greater air movement.

I have got Cat5e wiring, but not everywhere.

That was the first install ... just happened to be the right place. Even if some "nice" trunking is used to get the cable to the top, a high point with LEDs down is ideal for coverage.

I can also recommend the 7800N. Had mine a few days now. The well ventilated top surface does get reasonably warm. & I'm thinking it would actually be better vertical as it wouldn't catch so much dust.

One point that is not obvious but nice is that this is actually a 5-port switch - 4 Gb ports and a 100Mb port (the EWAN port can be used, I've got my printer plugged in to it now).