smart devices belong in an isolated network zone on your network.
I realize (and so does LG and many others) that smart devices offer a back door through perimeter security defenses. They understand that most people cannot defend themselves against (or even understand) this and also effectively use the product at the same time.
Effectively, many smart devices are trojan horses. Limit how many you use, understand whether or not they actually need persistent internet access, and segment your network if you have the ability.