If you just want to create a new SSID for an IoT network on the MT6000, you can refer to the steps below—or wait for version 4.9, where IoT SSID support will be available directly in the GL UI.
However, if you need to use it together with other APs (including another MT6000) while maintaining the separation and characteristics of LAN, Guest, and IoT Wi-Fi networks, the overall setup becomes quite complex.
You’ll need to configure VLANs on the main router/AP for LAN, Guest, and IoT, along with firewall rules to keep devices of Guest and IoT isolated.
Below are some examples from other models/firmware versions with similar requirements that you can use as a reference.