networking - How to create a home network over a wide area

I am trying to design a flexible and "future-ready" home network for our 3-story, 5-room townhouse, with a 4-port ethernet wall plate in each room, using one of the ports in each room as an input and the other 3 as outputs. This would give us, and future inhabitants, the flexibility to plug the source from the modem/router in from any of the five rooms.

However, all of the ethernet switches I've seen so far have only one input, rendering my otherwise practical idea next to impossible, without manually splicing cables together, which would no doubt take the Big Gs out of bit rate of the cat. 6(a) that I was planning on using.

Keep it simple - 4 ethernet cables from each room to a patch panel - switch connections at the patch panel to convert a port from an input or output port there. You can then make the connections from the patch panel to the router. An ethernet cable is an ethernet cable, and its simpler to just change what its plugged into on the other end.

I do this and I simply use 1 router and a few switches (if needed) and powerline adapters. It's really simple.

You plug 1 Ethernet from the router into a powerline adapter, which plugs into the mains. You can then use the mains to move the connection around the house.

Each room uses a normal mains plug socket for another powerline adapter and from there it plugs either into a 4 port switch (to give me the extra ports) or direct into the device (computer/music player/media streaming device etc)

The room with the switch has 2 NAS drives so I can also stream my music/video.

You can also (as I did) add a router to one of the powerlines, and set it up as an access point thus expanding your wireless coverage.

Naturally, this only works if the house's mains wiring is all connected! If you have different and independent circuits, the it won't work