I just purchased the M3 3 pack from Amazon. I understood based on the documentation I could find that I could plug in ethernet in each device. The video says just plug into the ethernet port. When I opened the box for inspection I see the cylinder has two ports Lan and Wan. 

I was hoping to extend my router to the basement for my camera system which requires an ethernet connection as well as add better wifi coverage in the rooms there. 

I see now there is a Deco P9. It appears this uses powerline.

When I started my search I was just going to purchase a new powerline adapter which has the ethernet at the main and at the remote. I was concerned because my basement is on a sub panel and read somewhere that would not work well.

What can I do to get an ethernet connection extended from the router upstairs to the room with the camera system? Any thoughts?