Those switches only work with a router that actually creates the vLANs. I use one with pfSense, running on a small box with a used Intel server NIC. So I have a mix of LANs and vLANs to keep stuff more or less isolated. If I want WiFi, I just stick an Alfa AP on one.

In any case, you're counting on the router to keep one LAN/vLAN isolated from the others.