Watch multiple videos at once

Ok, so you are Ozymandias or Batman or Sherlock from Elementary
The idea is to do this :

*i.imgur.com/1QV5183.jpg

you put up an array of different video feeds and watch them all together.

so it can be done on this site

Youtube Multiplier : Mashup and mix up to 8 YouTube videos on a single page

I had a go
DjSnoopSagan's TV Shoppe - Youtube Multiplier