Here is the dash cap in its usual, closed state:
Here it is, opened up and resting up against the windshield shade. You can see the two very long strips on the side and the smaller pieces in the four corners. This was the attachment from the factory.
The red circles show where I added two large pieces of Velcro to stop the plastic from rattling when we hit bumps. Worked really well.
This also allows you to acces a lot of things back there but surprisingly, not the video splitter. I wanted to experiment with a few things there, but it is simply the monitor with a single video lead that goes off to who knows where!
Hope your cap is as easy to remove as mine was.