Reddit reviews Cables Unlimited 2 Outlet Xtender Power Cord Splitter

I think maybe just a 1-to-2-port splitter is the best solution to this problem.

The basic MagicMirror is pretty simple to build and use.

You'll need:

• Old Monitor you can strip out of the case.
  
• Some scrap lumber to build a frame(will need to be thick to accommodate for monitor/pi/cords inside frame. Mine is 3 1/2", I think).
  
• a Pi, obviously. Will also need an SD card and power supply if you don't buy a kit online. Use NOOBS to install Raspbian(Essentially a Linux version of Windows).
  
• A 2 way mirror. Be careful with this one. The oils on my hand immediately wrecked the surface and trying to clean it made it worse. That said, if you can avoid touching it, it's way cheaper than the alternatives.
  
• This was helpful also, so you can plug in the monitor and the Pi but only have one cord coming out.
  
  After you've got everything together, look up MichMich on Github and follow the instructions. You'll likely mess something up here and there and it will take a few hours to get everything in the right place. If something isn't working right, don't be scared to hold shift when restarting the Pi and reinstall Raspbian and start over. It will be best if you can navigate to Github on the actual Pi itself(You'll need to set up Wi-Fi connection anyways), because you can then copy and paste the code(need to use mouse to post into Command Line interface) and just hit enter for most of it.
  
  That should get you set up with the basic magic mirror. After that, things get a little tougher, but should be manageable as long as you don't do too much at once. If you go to the Modules section of MichMich Github site, there is a list of all the 3rd party modules. Some of them, like the Scrobbler one, require you to create a last.fm account, get an API Key(Super easy, just fill out their form and they give it to you immediately), and then log into the scrobbler in your spotify settings.
  
  Once you have all that set up, there will be a section of code in the "Read Me" page for each module, and there will be sections that describe each option in the code and the effect it will have on the mirror itself. The part I always screw up is getting that code into the main MagicMirror Config file without messing something up. This file should be located at /home/pi/MagicMirror/config/config.js. It is stored as just a text file. Good news is there will already be default module options in there, so you just need to hash through that until you understand it to make sure you have all the right commas in plact. One piece of advice I'll give is that, generally, if there is an equal sign, there should be no spaces on either side of it. That one gets me all the time.
  
  There are some other Modules I like too, like score/schedule of NHL/NFL(requires tweaking if you want to feature one team, but again, it's all in the read me sections for each module). The weather one is pretty nice, but also requires an API from an open source weather site. There is an xkcd comic that is an easy setup, you can customize the "Compliments" if you navigate into the modules folder and find the compliments module code that contains the compliments. There isn't a TON of modules that really peaked my interest, but there is enough there to keep me busy setting everything up.
  
  My future plans are to add a camera, which can be used for motion sensing to turn the mirror off when no one is around, and possibly utilizing the module that contains facial recognition software to control the content that is displayed. There is voice and Alexa integration, and a wealth of other things that you can do depending on how far down the rabbit hole you want to go with integrating buttons and whatnot.
  

It should work with one of these.

https://www.amazon.com/gp/aw/d/B000234UFG/ref=mp_s_a_1_2?ie=UTF8&qid=1480999424&sr=8-2&pi=SX200_QL40&keywords=outdoor+extension+cord+splitter&dpPl=1&dpID=41Mg6CLjRBL&ref=plSrch

Get one of these and a second surge protector if you're under 10A total draw from the outlet.

I've decided to use this along with 2 of these

I also have an electrician coming to see about adding another wall outlet.

Here is the desktop version of your link

You could try these as an alternative, it has great reviews.