Great question — answering as the UphillTech team:
I cook a circular pizza on a pan as large as my consumer convection oven can accommodate and the pizza comes out great. The biggest risk is that the pan must be kept level to prevent the sauce and cheese from sliding down as the pizza cooks. In my oven, a pan two inches larger in diameter would nearly fit, but then the bent part of the rack makes the back just a little too high and causes the problem.
Full answer by Phil: https://cooking.stackexchange.com/a/110784 (CC BY-SA 4.0).
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