The Ninja AF180EU is an air fryer, and it doesn't have the traditional top and bottom "burning" in the sense of an oven. However, it does have a powerful heating element and a circulation system that cooks food evenly with hot air from above.
Hot air circulation from the top
Crisping Plate, which helps distribute temperature evenly on the bottom
Thermostat and timer for precise cooking
So, it doesn't have direct bottom burning, but thanks to the special design, you'll get a good sear on both sides.