Depending if you need better wifi in that part of your house, you could plug your Roku directly into the PowerLine adapter. I did this in my basement.I cut the cord almost a year ago. I had quality issues at first because my wireless router was too far away and signal wasn't strong enough.
I used a PowerLine adapter and installed another router (repeater) on the other side of my house. Quality is much better on the TV and now I can get WiFi in my backyard as well.