The weird thing here is that host Jim O'Connor and Uno's manager Rod D'Angelo do the "step-by-step" pizza build,
where we see them put the veggies on halfway, but that was on a cheese pizza.
We see a clip in the first minute of the video where on another pizza,
they put the veggies on top of the sausage and under the sauce.
So there can be variables, even in the same restaurant, depending on what ingredients will or won't be in your pizza.
If I had to guess, Lou Malnati's probably has similar procedures.