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Paul,  unfortunately, a grill is not a great place to make pizza, since most of the heat is from the bottom, you run the risk of burning the bottom before the top browns.  Some have marketed items that are supposed to help make a decent pizza in a gas grill.  https://www.pizzamaking.com/forum/index.php?topic=20334.0  That is from a post years ago,  Bert subsequently made an MPO2 ,  I am not sure if he made an MPO 3,  but as you can see, what he suggested was using foil to block most of the grate, so all of the heat of the grill was confined to the area where the pie was cooking.    If Bert does not still offer an MPO model, you can try to do something similar with two pizza stones, and firebricks for the walls.  Another option is the OONI,   the Karu is about $330 if you go with a wood version, gas in an extra $90.

Paul,  unfortunately, a grill is not a great place to make pizza, since most of the heat is from the bottom, you run the risk of burning the bottom before the top browns.  Some have marketed items that are supposed to help make a decent pizza in a gas grill.  https://www.pizzamaking.com/forum/index.php?topic=20334.0  That is from a post years ago,  Bert subsequently made an MPO2 ,  I am not sure if he made an MPO 3,  but as you can see, what he suggested was using foil to block most of the grate, so all of the heat of the grill was confined to the area where the pie was cooking.    If Bert does not still offer an MPO model, you can try to do something similar with two pizza stones, and firebricks for the walls.