Hello 

I have deco m9 plus 3 pack and deco m4 3 pack and all connected through ethernet cable i let m9 plus as the main router and  5 as satellite. Yesterday I was walking in the market and i found good deals on Deco x20 so I have bought it. I'm planning to use 7 Unit in my home 1 main router + 6 satellite but i don't know which Deco to use as main router. Is it m9 or x20 ? My internet speed is 750 mbps and all connection through ethernet cable