what size did you get, & is it a Presto?

here's the 11" ~ 2 pack, you can use 1 on the bottom & one on top everything if you are worried about the valves & gauge hole being blocked by foil or anything. https://www.amazon.com/2-Pack-11-Inch-Pressure-Cooker-Canning/dp/B0767LZGDM/ref=pd_bxgy_vft_high_img_sccl_1/141-9691043-9642150?pd_rd_w=P9sxi&content-id=amzn1.sym.7f0cf323-50c6-49e3-b3f9-63546bb79c92&pf_rd_p=7f0cf323-50c6-49e3-b3f9-63546bb79c92&pf_rd_r=N76W1ABNZB1JH1RDP27J&pd_rd_wg=vNkbY&pd_rd_r=f22296fe-d080-4862-8555-62196a7d9e4d&pd_rd_i=B0767LZGDM&psc=1

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this one has feet to raise it up a little bit https://www.amazon.com/GBSTORE-Cooking-Stainless-Diameter-Steaming/dp/B01HO1AI4A/ref=sr_1_5?crid=10S4J3HK7SLK5&keywords=bottom+silicone+disc+for+pot+for+steaming+or+cooking&qid=1677044145&s=home-garden&sprefix=bottom+silicone+disc+for+pot+for+steaming+or+cooking%2Cgarden%2C226&sr=1-5

I use one of these in mine & love it https://www.amazon.com/Silicone-Roasting-Cooker-Accessories-Round-Green/dp/B09V16PHP6/ref=sr_1_4?crid=BM2XKZ4E2OHF&keywords=bottom+silicone+for+pot&qid=1677044227&s=home-garden&sprefix=bottom+silicone+for+pot%2Cgarden%2C272&sr=1-4