There are national rules about mounting surge protectors. For safety, surge protectors with 3 or more receptacles can not be mounted in a way that prevents its removal by hand. The thinking is that in an emergency, you can not remove the protector without looking around for a tool. That is why we offer an optional shelf for these larger units.
A Zero Surge 2R falls outside of this rule, so you are allowed to mount it. We offer an optional set of brackets. There are four locations on a 2R that can be used to mount it. Only 2 brackets are necessary to hold up the 2R (even under a ceiling).