We have a Netgear VLAN that I run some of my wired IOT devices through. The Smartthings hub is a natural, as well as cameras. These are usually wired and use IP connections. The VLAN switch segregates traffic away from you network.
As far as wireless such as Nest thermostats and Rachio lawn system, I utilize a guest channel at present.
Stacey Higginbotham has a great IOT podcast at https://iotpodcast.com/
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