If you're looking for a true all-in-one device, this Instant Pot Pro Crisp is a great option. This is a combo Air Fryer, Electric Pressure cooker, and Slow-Cooker. It has options to sauté, sous vide, keep food warm. It also works as a mini oven, broiler, and dehydrator. It's pricey, but may be worth it instead of purchasing each of these items individually.