Wirelessly Controlling Multiple LED Walls

G'morning all, WHAT I HAVE: I have five sets of motorized LED walls and each set consists of 3 separate walls so, this makes a total of 15 walls and, It is my job to set up different content on each of the walls. The way these walls have been set up in the past (before motorizing them) is, each set of 3 would have 1 controller (send card) which would be connect via cat5 to the 1st tile of wall 1 which, in turn would loop and connect all three walls of the set. WHAT I WOULD LIKE; I would like to replace the cat5 inter-wall loop with simplistic wireless receiving devises. At the moment I have a Netgear N600 which I use to control single walls, the main reason for the N600 is that it has a usb outlet which, I can use to connect to my controller (send card) and communicate wirelessly from my laptop to the wall. So this will leave me with 5 sets of three walls and each set will have wireless communication within it's set only, whereas, each of the 5 sets will not be able to cross communicate with each other. Any suggestions would be greatly appreciated. All the best Gary