Are these Android devices? Do you have our Google Play Android app installed there on those Smart TVs?
Unfortunately GlassWire cannot track your entire network because that would mean it would need to interface with your router.
However many people world-wide use GlassWire to stay under their ISP and mobile data limits. The reason people use GlassWire to stay under their data limits is because in most cases PCs are responsible for data overages and GlassWire can show you in detail what apps/hosts are responsible for using your data. You can then block those apps with our firewall, or just uninstall them.
And as you posted, we also have an Android app https://www.glasswire.com/glasswire-for-android/ that also focuses on data usage, and can show Android device data usage for WiFi and mobile.
GlassWire also has a “Things” list that shows all the IOT (Things) on your network. It can alert you when a new unknown device joins and starts wasting your data.
Please let me know if my answers helps you or not so I can get your issue solved. Thanks!