Oculus VR free navigation


I am quite new in unreal and oculus integration. What i am looking is to develop an app for research project with subject to METRO station evacuation.
My current issue is how to setup the navigation so as to have free movement of the participants. Meaning that we are going to use it in an open landscape and we want the user to move freely in the area just by using the headset and the controllers will be used only for object interaction (and maybe with stairs). I have setup to walk with controllers and works fine but the free walking (oculus guardian is disabled) and the orientation does not.

Any help on that will be great

I have attached some pics