Yes, but this can be used when you want to put the protector on your lan without touching anything in the LAN. It cannot do web filtering based on client ip, but all the rest works.
Then, if you already have a firewall, a IPS etc, ok, but the protector can do it better, and it has the email filtering that a normal router doesn’t have
In this diagram you can put the Protector on your LAN without touching anything in the LAN configuration.
This scenario will give the benefits of Firewall, VPN, IPS, 640 Million IP Block List, Email Filtering/Archive, Anti Virus & Application Blocking.