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use a 9" box for each one

That all depends on where all of the zones are in relation to main line. I hate to see bunches of the rounds all over the place, looks dumb to me, and they only fit one valve each. I would opt for standard boxes with two or three valves in each with up to four. They sell six valve manifolds, but require a jumbo box. They are JUMBO though, and would have to be in a place no too easily seen. I have found that drip zones with filters require a little more creativity sometimes since the filter takes up so much room. What I do is dry build the valve manifold on a table then play with different configurations until I like what I have. Hope this helps.