I would rather have it in the center because the majority of it will be blocked from view by rock and coral. The sides you can't squeeze much rock in there to cover it on a bowfront cause it's narrower.
I decided not to buy I after seeing it, it had green algae in the sand bed against the glass, and algae on the overflows, and some silicone on the outside of one of the seams. On top of that there were scratches in he glass on the inside that were very noticeable because of algae in the scratches. All that said he had 300 lbs of live rock and it is a nice big tank, oceanic brand which were built well. For the money it would save me probably 1000-1200 bucks vs new once I add rock and lights to a new one, but I am just a little nervous of those things.
I hope I don't sound too picky, I just don't want to buy a potential headache and have to transport it 60 miles.