I have bought the above and have been told i can use it to strengthen or extend my network, as it will be better than my router. I have been told by apple tech help that I should connect it by ethernet to the router and set it up as a new network, but I'm not convinced that this will achieve this. Can anyone advise me on how I need to set it up to do this, please? I have a macbook air so cannot connect it to that but obviously could connect it to my router. Thank you.