It’s difficult to get a good picture but I measured the gap with callipers at 5mm either side so there is a lot of lateral movement to hit the pads. They’ll make contact when cornering hard and sometimes even when seated.
It’s a 24h rear, but I’ve used several 24h wheels over the years without issue. I have a set of 16/21 spoked Fulcrums that are solid. Yes, if I actively try and get rub with those Fulcrums I can, but I think they show that with 24h it should be possible for the Zipps to perform.