Hi, im trying to make a 4 way split screen for a music video that i am making. I can get a 4 way split screen but i want the splits to be separated so it looks like i have 4 separate screens and not 1 large screen with 4 different goings on in it.

Another thing i want to do is to add an MTV logo in the corner to make it more authentic, how do i go about making a watermark? (i think)

If this was coherant enough, can someone help me?