Anchoring a prefab spawned by tracked image

Unity Engine
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1

Is it possible to spawn a prefab once the camera detects a reference image and then immediately anchor this and not allow it to move when the reference image is no longer in view? I’m attempting to spawn a very large prefab when a user scans a QR code located on the floor and then have them be able to look up and walk around the prefab without it moving once the QR code is no longer visible.

2

I’d done this by setting the position and orientation of the spawned prefab manually when it’s generated, rather than parenting it to the image:

  void OnChanged(ARTrackedImagesChangedEventArgs eventArgs){
    foreach (var trackedImage in eventArgs.added){
      if (trackedImage.referenceImage.name=="trigger_mushroom"){
        GameObject shroom = Instantiate(mushroomPrefab, trackedImage.transform.position, trackedImage.transform.rotation);
      }
    }