Warmer that holds an 18" pizza box?

I bought one advertised to hold a boxed 18" Pizza. It didn’t so I’m on the lookout for one that does. The 18" pizza goes into an 18.5" pizza box.so that would.be minimum width and depth. Any help?

Metro C5. Holds a 16 across without having to create some kind of shelf. It also holds our 20" box