Vertical rod storage

I just bought a used Pro Angler, and I want to stow all my rods (at least six) vertically so as to maximize the number of tackle boxes I can stow along the sides (i.e., not use the horizontal rod storage).  I saw the Hobie livewell with the rod holders but I just don't need a livewell yet.  Ideas?  Can I bolt rod holders to the back of a PA seat?  Will I need to put a crate back there?

I have a mod from PVC it basically makes a single rod holder into a double. I don't see why you couldn't make it a triple or quad. I can snap a pic when i get home. it looks like an upside down lower case letter "h"

Not sure if the PA has rod holders in the rear but if so that may be a solution.

Milkcrate with PVC pipes

Milkcrate with PVC pipes

probably the best bet.
But why so many rods?

Isn't the number of fish you catch proportional to the number of rods you carry?

Must be a bass guy. I carry 5 usually. All rigged different so I dont have to mess around when changing styles or baits. Sometimes 3 bass rods and 2 trout trolling rods for those multi species days.