I didn't take any pictures of mine, but I used the wire method, and tucked the wiikey on the right side down in the black plastic housing (well wrapped in electrical tape). I did this based on a guide I read, mainly this one:
But I can't seem to find the guide where the wiikey was installed on the side. The wiikey is pretty small, its easy to place it where you want. I would highly recommend a wire install as opposed to the quick solder points. Although that install linked above does look pretty slick.