Yes the blue lines represent were the studs are located. The studs are glued. I used a locator and tapping on the wall to find the studs. Not hard to find them. The square hole is for the outlet and cable connection box. I used the existing Entertainment Inverter so I just ran the wires up from there. Pretty easy install.@Nodak7 On the pictures with the blue tape, what do they represent? Are the long vertical blue tapes the location of the studs? What is the purpose of the square hole you cut? How did you locate the studs?