Most people here will tell you that what you really need is NOT a surge suppressor (protector) but, rather, a power management system that will protect you from far more common occurrences such as: low voltage, floating neutrals, reversed polarity, etc. Some RVers, unfortunately, don't understand the difference between surge suppressors and PMS's and, therefore, lump all such devices under the generic term "surge suppressor."
That being said, I don't have any idea what you have purchased nor what is already built into your RV. Multiple surge suppressors wouldn't hurt anything, but multiple power management systems might interfere with each other. If you can tell us what you bought and what has already been installed, the people here can give you some better guidance.