Using the OEM stone I’ve also found it important to make sure the stone is hot enough before the first pizza goes in (750+) and that the fire remains at full force during the cook (I have the old pellet version that requires a bit more fire maintenance). With these two conditions satisfied I can roll directly through multiple pizzas (we usually do 6-8).
I got my Ooni Hack turntable installed, works fantastic. https://www.oonihack.com/ have to turn down the heat now as the stone is much closer to the roof and heats up super fast.
If you get the OoniGear one there are no holes or mods to the oven at all. It clamps to the unit via a hole already there. The only thing is you have to get is a round pizza stone.