On my previous router (ASUS RT-n16 with Tomato) I was using multiple SSIDs associated to multiple VLANs in order to isolate potentially unsecure IoT devices (Wi-Fi scale, sensors, Google Home etc) from my WiFi network.
Is this possible using Turris MOX? I yes, how do I configure it?
It depends on the card. You can use iw phy to see the exact number that each card will support (at least theoretically).
If you have a lot of devices that don’t need to communicate with each other, if the card supports isolation, you can use that (prevents clients within a single SSID from communicating with each other).