Not OP, but I make extensive use of VLANs to isolate off security cameras, IoT devices, etc. etc. into their own mutually isolated network environments.

I also don't use Wifi for any of these devices anymore. It's usually a bad experience. Either use ethernet or a dedicated IoT-oriented wireless protocol. Z-wave seems OK but not very flexible, Zigbee is a pain in the rear (but the only option for many device classes), and I'm hopeful that Thread will actually be good.