I am moving soon to an old house with solid brick walls to give you an idea my current isp router signal will not even get out of 1 room. I want to introduce a good quality vpn router this I believe will cable to the isp modem.. then turn off the isp wireless signal. that should cover the ground floor then cable up to the next floor and put the mesh units in the upper rooms. I have been told that this will create 2 different networks up and down stairs I know my signal will not go to my upper floors from the ground floor. I dont know if I can do this another way but my electrician said the earth loop on one floor is not connected to the other. cant find out much about mesh networking