In your case a small ZoneDirector controller is recommended, specially for warehouse deployments so that the APs are 100% doing what they do best, pass traffic. However, like Tim mentioned, you can use our Unleashed software which allows the AP to still work together as a group and coordinated, but without the need of controllers. This works for up to 25 APs. It is easy to deploy and very flexible.
Either way you go, you have chosen the right product. We welcome you to Ruckus.