So im building an art table for my daughter. Just a basic desk type of design, but instead of a drawer centered on the front, im building it with a sliding top with storage underneath. Center split top with each half sliding outward to their respective sides. My question is: I have some sturdy soft close slides that I took off a desk that was damaged at work. They are 3 months old so naturally I couldn't see them go to the trash. They were side mounted on the desk drawers. Can I use these for the undermount application I intend or are there specific types of slides for undermount? I've looked and dont really see anything definitive, just that regardless of the application they all look the same.