Hello, sorry for the confusion so here is the correct layout as far as decos are concerned Modem - hallway main deco -wireless deco. I only have 2 deco setup on a 2 story house. I dont plan to 100%...

I need help on how to fix my setup. Modem -> Deco -> Switch -> LAN Modem -> Deco -> Wireless Deco Hallway (2nd floor), Living room (Ground floor), I've set it up as they are directly above and below...