Comment by drnick1

> That can be cameras, tv's, thermostats, tv sticks and anything else that might not only call home

That is not enough. You need to air gap devices that have legitimately no business communicating with anyone or anything outside the house. TVs, thermostats, and other Internet-of-Crap gadgets do not need "firmware updates." Either they work out of the box, offline or within the LAN, or they get sent back for a refund wherever they came from.