One thing I have bought "special" for my ninja dual drawer
https://www.amazon.co.uk/dp/B0989VC4M9?ref=ppx_yo2ov_dt_b_fed_asin_title
My Ninja is 2 coming 3 years old and the non stick isnt as good as it was on the trays. These allow the air fry technology to work, no heat is being blocked, and the trays/racks are easier cleaned. They wont keep your machine clean, just stop food from sticking
A word of advice if I may, to new users, The drawer models are very intense fan ovens,.Grease will be thrown about them with abandon and unless you give then a proper wash ( think of the drawers as your roasting tins ) grease will build up and stick, and the non stick will diminish. Dont use steel balls or brillo pads. What I have found works best ( and mines old but does have some build up ) is immediately when empty, fill with hot soapy water to the top. Then when going back to wash, use those cheap plastic wrapped sponge scourers , you know the garish pink and yellow ones or a posh spontex one for treble the price
Other items I have bought over the years , cheap 6 inch cake tins from B&M. Believe it or not, you can get a decent cake from a small tin and you can do your yorkies in one. Sometimes the yorkie can be a tad soggy bottomed, no bother, take it out and flip it upside down. A loaf tin with no lip - you need a straight up and down one, I also have a pullman tin ( one with a lid)
Dont be afraid to give things like broccoli a wee nuke first, just to get the stem tender
Buy a spray bottle and use proper oil. Frylite will kill the non stick quicker then a Brillo pad
Dont be afraid to layer food. I can easily get 8 slices of back bacon and 8 sausages in one drawer, sausages on the bottom, bacon topped and tailed with just the fat edge exposed, and then as the bacon shrinks - as it always does - re position it and then bring the sausages to the top to brown. The other drawer Ill have tomatoes halves on the bottom, mushrooms on the top, and again as they shrink down I move them about
I honestly think the only things I DONT cook in the air fryer are eggs. Why waste the time and energy trying to get the settings correct when a small pan of water on the hob takes less energy