There is no non-IoT 2.4ghz network in my design. All "fast" devices are on a 5ghz only network. The only 2.4ghz network is dedicated to IoT devices. This also eliminates the need for devices to hunt and roam between 5ghz and 2.4ghz unnecessarily. Just need to balance tx power to make sure the 5ghz handoffs are as smooth as possible between APs.