I've got the dbot5 double surf rack, and just have to alternate the direction the boards are sitting, and basically the kick-pad of each board protects the other.
Dan, how many times have you been out with the Endless Wave rack? I'm looking to another rack and am considering the EW, but am worried it won't be as easy to access with it on top of the tower. To quote wake9's review, "you have to be a monkey to get the boards down" (or something to that effect)