Powerline Adapters are great, you should have a look at TP-Link's range - http://www.amazon.co.uk/TP-Link-TL-WPA281-Powerline-Extender-Configuration/dp/B00ECBROCK/ref=sr_1_5?s=computers&ie=UTF8&qid=1397059659&sr=1-5&keywords=tp-link+powerline
They are birll. Set up a couple throughout your business and change the SSID's and passwords to the same as your routers and you will have one continuos wifi signal, not different connection points.