why is my non VR camera working for my htc HMD when I hit play?

figured out when in the player settings VR support is enabled all cameras can render HMD's. How do I go about using Steam Camera rig prefabs. Should I use the prefab for the camera that steam uses or add all the crap to my main camera in my game. just confusing what rout to go about after I have imported the steamVR asset store package and trying to figure out wtf to use lol.