Height for rod holder rack?

I have a 16' Tracker, which has a bass boat style casting deck aft. I am planning a rod holder rack that would go across the back of the boat and drop into 30 degree flush mount rod holders. I plan to build it so that the horizontal bar will be as far aft as possible, to maximize the mount of available deck space. How tall should I make the horizontal part? It would take 24" to clear the outboard. I'm thinking 30" or so, maybe 36". Does this sound about right?

I figure that the hortizontal bar will be about 60" long, giving me room for five Monster Rod Holders.
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