HotDog Roller and Bunn Warmer

Hey
I own a small c-store and I wanted to add a self service hot dogs.
I wanted to know what would be best. Hot dog ROTISSERIE or Roller Grill. Which one would make the best hot dogs and would be easy to self serve also which one would be easier to clean.
Will they be able to cook both frozen raw hot dogs and warm frozen cooked hot dogs?
Should I buy raw frozen hot dogs or cooked frozen hot dogs. Any preferences would be appreciated.
I’m pretty sure I would need a bun warmer too. Can you guys tell me what else should I get like extras.

Thanks a lot.