SonicPoint 621c to POE Switch

Right now I have a building that has 5 different SSIDs and people are constantly asking which one to connect to from what area in the building. Is there a way to connect a POE switch to my Firewall(TZ470z), program a WLAN interface, and then connect all of my SonicPoints(621c) to it to create a mesh network? Would I need to connect every AP directly to my firewall and program each interface? I have 3 of these APs that I would like to setup. I've only successfully setup one of these SonicPoints and have no idea where to start to create a mesh. Thank you!!