What is the correct connection for ethernet backhaul? Modem > Router 1 WAN > Switch > Router 2 WAN or something different? I cannot get my mesh connection beyond "Acceptable" in any configuration. The ONLY time I have had an "Optimal" connection was when the routers were literally 6 feet away from each other. Right now they are about 15 feet (1 router in basement other is almost directly above it on top floor) away with only an "Acceptable" connection. If these things need to have direct line of sight in order to have an optimal connection, then you guys are misrepresenting the mesh capabilities of these routers.