Christ, you're eating a frozen pizza. Cardboard, with ketchup on top... Stick it on a cookie sheet, or on the rack directly, it won't matter. It will still taste like cardboard, with ketchup.
If you want to get all exotic, you can play with the rack height, or put the thing in the oven before the preheat is completed and the heating elements are still glowing red-hot.
Better yet, make a batch of sauce and a pile of dough. Stock up on a little cheese, pepperoni, sausage... When the urge strikes, make your own pizza. Takes no time at all, tastes like real pizza... and it doesn't have to be cooked on a pizza stone, either. Many years ago, when I was a pizza cook at a high-end pizza restaurant, I cooked thousands of the lousy things and not a single one was cooked on a bloody pizza stone...
Cheers,
JR