You may want to grab an extra Inner Cooking Pot, Stainless Steel Rack, or even prefer to use a Ceramic Non-Stick Instant Pot Inner Pot instead of the stainless steel. With that said, I love the stainless and find that even burned on food wipes out easily if you let it soak overnight.
If you plan on doing some slow cooking in your 6-quart IP you could get this lid or even this one that also doubles as a spoon holder. So far I haven’t seen them for other sizes.