As always, you are right and your husband is wrong.
I've tried strips of foil below the pizza in a circumference pattern just to catch any combustible dairy droppings (which works) while allowing more direct, crisping contact, with its bottom.
Half the problem is frozen pizzas. By definition, they will be a bit soggy. The other half of the problem is him. And he'll grow tired of pizzas-delivered-steamed-in-a-box, also soggy. I haven't searched but I'm willing to bet that this DC website has a few simple recipies for gluten+dairy-free pizzas from scratch that'll make both of you happy.