Wonder if anyone is able to offer me some advice. 
 

I have a 1950's style three bedroom home that hates wireless networks. Blocking most out and making connection an issue. my current set up is;

X50 - Main unit - in kitchen

M5 - WiFi connected in living room

X20- WiFi connected on Landing

M5 - WiFi connected in main bedroom

M5 - WiFi connected in office

** The main unit connect directly into our EE router via Ethernet cable. 

My questions are;

1) Am I able to connect via Ethernet from the main X50 into the X20 on the landing?

2) If so, will this increase the WiFi signal / power on the X20 on the landing?

3) & will the two M5's which are upstairs then connect to the X20 to improve there signal further? Although I'll need them to connect wirelessly?