I looked into the staggering option but that would not work. In that install there was not enough room for two vertical reels with enough rod clearance.
iFly's web site has a similar setup on their home page ->
http://stores.theifly.com/StoreFront.bok
You should also check out Du-Bro rod holders.. I know a few flyrodders that use them.
There are also the TACO Rod Hangers and TACO Bungee Rod Holders.