Last pizza I did worked out very nicely. I have a weber with a rotisserie ring on it. The ring comes in two pieces that you bolt together, I added another set of SS bolts 90 degrees to the originals and this allows me to use another rack obove the original. I build up a charcoal base, then put a large pizza pan on the lower rack to act as a diffuser(thank you green egg) then use a pizza pan on the top grill.
You can see one of the added bolts in this pic, sorry I'm too lazy to do the whole pictorial thing, right now. Next time I do pizza I will. Looking at the pic. you can see on the left side the original bolts, bottom one is outward and the top one is mounted inward to provide a mount for the grill, and on the right side is one of the additional ones.