This is the standard stage setup for San Siro, unless there are big catwalks.
35k is very low for the stadium and one of the worst turnout ever for the stadium. That being said, the turnout will probably be the highest of the entire tour (probably even more than some double stadium shows) and it's slightly more than Padua last year. Last time they did back to back tours in Italy I think they gathered around 50k people, this time they're aiming to 70k+.
Long story short: overall a success, but it's gonna go down as one of the biggest "flop" (in terms of attendance) in the history of the stadium. But I've heard they want to demolish it, so who cares.