Hello all.  I am thinking about buying the M9 Mesh system but I am worried about signal strength between the access point devices.  My house was built in 1930 and the walls and ceilings are plaster and lathe.  Historically I have had terrible wifi penetration and have burned though a dozen different flavors of wifi router from Tenda to Linksys to TPLink and Unify.  They just don't cover my whole house from the front porch to the back deck and the 2nd floor to the basement (house is 1,000 sq. ft per floor).  One thing I do have is CAT6 cable everywhere.  If I understand the mesh concept the primary unit is connected to the router/switch/etc through CATx cable but the "slave" units communicate to it (and each other?) via a back-haul wireless network and that is my concern.  Is it possible to connect the slave units to my switch and use CATx cable as the backhaul instead of depending on a potential brick wall between them with wifi?  Thanks for your time.

GS