Ember kickout is a real safety concern of charcoal grills. This isn’t an issue if you’re grilling on concrete or another non-combustible surface, but some of us want to grill from the comfort of our decks. Hedge your bets with something we wholeheartedly recommend: a grill mat. When placed under your grill, a grill mat separates the wood (or similarly flammable) surface from that fountain of stoked heat; this drops the likelihood of a stray ember causing a fire.