Hi, I don't think this would be work with the smart plug.

So you don't have a router? Did you configure the smart plugs like the instruction in the faq? http://www.tp-link.com.au/faq-946.html

Hi, do you mean all your devices cannot see the Wi-Fi name of the smart plug when it's on default settings? Have you tried reset and different locations?

When the connection drops, how many devices are connected to the modem? What are their network behaviors? like large flow downloading,playing games? Are you able to access to the modem's management...

Hi, this model doesn't support bandwidth control, QoS is designed to ensure the efficient operation of the network when the network overload or congest. It can specify priority of traffic and...

Hi, refer to the FAQ to change the wireless password, better to setup the wifi password with letters and numbers, capital and lower case. http://www.tp-link.com/us/faq-399.html