Always place an air fryer on a heat-resistant surface - like on top of a silicone mat - that way you shouldn't have to worry about damaging your countertop. While granite, quartz, and concrete are all heat-resistant materials up to a point, you’ll want to take the proper steps to protect your countertops by not placing your air fryer directly on your kitchen counters while the air fryer is in use - or while it is hot. Some countertops are less suitable than others for air fryers, mainly depending on how heavy the fryer is, how hot it gets, and how much you plan on using it. To be safe, always place an air fryer rack or a heat-resistance mat under the air fryer before use.