I'd probably leave a little space above your amp, just to be on the safe side. As for cable length, in my setup I use 0.5-meter PCA's between my universal player and my 990 - they barely reach, and that's with minimal lateral travel (the Yamaha's output is only a couple inches over from the 990's multichannel input). I'd be a little leery of being able to reach every channel of a multichannel amp with the 0.5-meter cables - the 990's pre-amp outputs are about a quarter of the way across the rear panel (3" or 4" over from one edge), while the amp's inputs are spread all the way across the rear. Most channels would probably work fine, but the channels farthest away are going to be nearly a foot away before you factor in travel down from one unit to the other and length used up in bends. Somebody who's tried it could give you a better idea - my Model 750 is too far away to make it an option anyway and my Model 200's are even farther away, so I haven't tried it. You might mix it up a bit, use five 0.5-meter and two 1.2-meter cables?