yea that's a good idea, isolating such devices on a separate network also helps for intercepting traffic, or active measures like TLS stripping, if you want to do protocol reverse engineering

tbf i already have that.... i am one of those people that has 4 subnets in a 50m2 apartment... the network topology is more like some kind of Winchester mystery house

but if you can you probably want to get bluetooth instead of wifi-controlled ones so the reach is restricted physically, this still leaves the app and its potential spyware to deal with but... 😫