Projecting onto curved surfaces

Hey guys I have a quick question for anyone that can answer.  I have a surfaced enclosure for a circuit board.  Its kind of like a ergo grip enclosure.  Internally I want to place (4) stepped post for the circuit board to sit on, so after I project the circles (post) onto the surface no matter what direction they are facing they need to come straight up.  Does anyone know how to do this easily.  Thanks in advance for the help.

SolidworksAssemblies