Each RFS6000 can adopt a maximum of 256 supported access points. The licensing can be 48 AP licenses with 208 AAP licenses or no AP licenses and 256 AAP licenses. The total number of adopted and managed devices cannot exceed 256.
Access Point licensing is shared between controllers, so in an “Active / Standby” scenario, it is common to order one controller with licenses and the other as a “zero port” controller, as it will share the licensing of the active controller. If both controllers are ordered with licenses, understand that any one controller can only adopt as many AP’s as it is capable of handling in hardware. In other words, though you could order two RFS6000’s with max licensing (256 licenses each), a single controller is not capable of adopting 512 access points should one controller fail.