If the zone director is too expensive and you will not need more than 25 ap's for your project, then just purchase the ap sku's for unleashed.

Unleashed is the virtual controller ran on the master ap of the system. Any ap you add after configuring the first one gets added automatically to the system.

Majority of my Ruckus systems are all Unleashed. I'm talking under 6 ap's total for most projects. Set it and forget it. In the 7 years using Ruckus, I haven't had one single callback for wifi related problems.