You seem to be misunderstanding the way the vive and Vorpx works.
If you want to play a stationary 3rd person perspective game your choices are:
1] Play it in cinema mode, which VorpX can do. Like a huge 3d monitor.
2] Don’t play it.
Cinema mode requires head tracking. You could turn it off in Vorpx and then you’d have to keep your head absolutely still. But as Ralf said that’s a bad idea.
You can’t move the headset to another room, the compositor for SteamVR requires head tracking lighthouse data [the base stations] to send any image to the Vive.
See:
Will the Vive work without lighthouses?
by u/goalcam in Vive
https://community.viveport.com/t5/Developer-Support/Using-Vive-with-external-Tracking-without-Lighthouses/m-p/12115#M278
Best solution: Same room, folding table, wireless mouse and keyboard.
Hope that was useful.