I wouldn't assume anything as far as stage layout is concerned. When the I&E tour went on sale the layout shown on all the ticket websites for all shows showed a centre round stage with catwalks extending to both ends of the arena. Much later on, when most of the tickets had been sold, the layout changed to what we eventually saw. My wife and I has tickets in the second-most expensive process tier which were for seats at one end of the O2, which turned out to be dead centre behind the stage with not even a hint of a view of the screens. We still enjoyed the show, but it was nowhere as good as it could or should have been for the 2x£100 ticket price. I was going to complain to Ticketmaster afterwards, but figured I wouldn't get anywhere so didn't bother in the end.