Only problem with the powerplugs is they can mess up poorly screened electrical items like video games, televisions, radios and hifi the signal to them is noise on the mains which they should filter out but some dont
There are several ways to use wireless I use mine to give a wireless bridge to where my main PCs are they connect through a high speed hub but then go through a wireless access point in client bridge mode to my wireless router connected to the internet. I turn off SSID bradcast and use WPA-PSK security to make sure no one is using my connection and bandwidth. If you have poor reception anywhere you can use a wireless access point in repeater mode to extend the network.