If you expect a customer to run the system through their own home network, then you are saying you expect them to have a working router.
What part of LANs not requiring a router do you not comprehend? LANs get along just fine without a router. It is only when you decide that you want to easily connect your LAN to the Internet that a router may
be needed. Switches (or hubs if you have no self respect) are mandatory for an Ethernet LAN but routers are not.
A router should NOT be considered a bad thing and if you'll recall, DIRECTV can't connect their devices to the Internet (as they are very
determined to do) without one.
Too often we enjoy the comfort of opinion without the discomfort of thought. -- JFK