If you still have the steamer insert for the pot, put that in place and rest the saucer on that. The saucer needs to be fully supported on the bottom or it will crack. Plus, the steamer insert can act as a diffuser for higher heat cooks without the saucer. If you want a 2nd rack, get the CHARCOAL grate for the 18" weber, I believe it's part #7440, and place it directly on top of the saucer. I've used this configuration many times and my saucer has yet to crack. I've also had great temperature control and stability. I've never cooked without the steamer insert in place and have been able to dial stable in temps from 200˚ up to 375˚.