GadgetGuy’s take: We need perimeter security
The most logical way is to think of the D-Link D-Fend AC2600 is as a perimeter security device in addition to your home network. Five years of SHP (usual cost $600) and two years (unlimited devices) for Live Safe ($299.99) make the $499 cost a bargain.
And if you think I am kidding, I already use perimeter protection devices, and there is not a week that goes by that a botnet does not attack the system and look to infect IoT devices. As far as I am concerned it is a no-brainer.