I just ordered a pair of these - - and I have a couple of questions - first what is the MIMO used for? Is the connectivity between the 2 units over the electrical wires exclusively or is there some mesh or radio connectivity between the 2 units? That being said if so, what frequency do they use? Also I understand they have WIfi built in - can this be disabled and these used strictly as an ethernet connection providing multiple ethernet ports on the same LAN? Also can the SSID's be changed on the Wifi? Thanks in advance.