Remove positional tracking in Steam VR app

Hello everyone. I'm acutally working on a game. In this game it is very important to not be position tracked. I would like to use my headet like a cardboard, only rotation. I've juste spend like 5 hours trying to figure how it is possible to overwrite transform.position values of the headset but nothing seems to work.

Is there a solution? In fact I am creating a prototype of a machine that user can control and it is very important to keep the headset centered in the game.

Sorry for my...

Remove positional tracking in Steam VR app