Browse - Computer Tips - Wi-fi: Robust way to spread wi-fi all over the house.

Date: 2018jan2

Q.  Wi-fi: Robust way to spread wi-fi all over the house.

A.  Check out Linksys Velop Wi-Fi Mesh 
http://google.com/search?q=Linksys+Velop+Wi-Fi+Mesh 

That's the best rated by CNET.  But I haven't used it.
There are others.