Morey, devices like BitDefender box can be a good addition to securing your home network. In looking I did not see the Box 3 being available so I will base it on the Box 2.
If you are running quite a few wireless IoT devices and tablets/phones not running an A/V, the additional security features of the Box 2 will help protect those devices. If you are just using computers already protected by Total Security, and follow best practices, you will likely not see a big benefit. If you would like to reply back with what kind of devices you are running at home, we would love to help you look into this in more detail.