I use the Berkely racks that are for horiz. or vert. I use them vert. as this leaves no worries about warping. But, I just built 2 9' rods, and 2 8' ones, these won't fit vert. in the space I have, so I'm going to get another set and hang them over my closet. My suggestion is put as many as possible vert. Then you won't have to worry.

Amish Ed