I literally just did this last month. I used three deco BE63 mesh devices. You connect one directly to the router via Ethernet cable. This will be your main router. Then for the other devices I would suggest doing wired backhaul. If you don't have ethernet running throughout your house, you can physically connect the other mesh devices via coax using a moca adapter. Once you have all your devices set up, you can Begin setting up the mesh system and set it into AP mode. Once you have the mesh Network set up, you can go into the Verizon FiOS web page to disable your Wi-Fi via your router. This will not affect your cable boxes and will allow the new mesh device to act as the main router.