I believe your trike will come with SPD pedals. If you are inclined to wear SPD cleated shoes you'll have no issue with your feet leaving the pedals under normal circumstances. I rode with cleats on my trike for many years but started to have foot pain related to how the cleat positioned my foot on the pedal. I now have platform pedals with
PowerGrip straps and they are working perfectly. They hold my feet secure in a position more suitable to me.