Before I buy an Archer AXE 300 V1.60 WiFi router I want to confirm the wifi coverage area. I have a 2600 square foot home and want to know if this particular router will cover my entire home from the second floor (where my cable modem is) down to the first floor.  How many devices can this device handle?  Most importantly I need a WiFi router with two 2.5G WAN/LAN ports.  I read that this device has one 2.5G port and two 10G ports.  Are the 10G ports on this device work with devices that need a 2.5G connection?