Sur La Table sells a S'mores Cone Rack. Why do you need this? No losing marshmallows to the fire. No mess, either. Holds 12 cones at once--upright and secure. Stainless steel.
S'mores Cones on the Grill
Add waffle or sugar cones
Fill with Chocolate and Marshmallows (mini mashmallows work well, too)
Don't want S'mores? You can add other chocolate candy bars to your cones. Yum!!!