So implified the whole thing to make it simple
I don't know how to make a demo but I think it would just confuse you. I deactivated the shadows. So here you see the player between two walls. The walls are over the player to make a little 3D effect.
I put the Dead angle (black thing) on top. It looks cringy like this. So this is why I prefer the player being on top of the Dead angle, Dead angle being over walls (so you can't see them behind you when looking in the opposite direction) and the walls being over the player.
Hope it makes it clearer enough;)
Tanks for for considering the subject.