Nice, still you have the issue of only being able to scan tags within 3-5cm, or so, depending on tag size?
With the parallax it sometimes needs the tag to be waived around 'wildly' at an angle, for it to take a reading. I think it's possible to do what your wanting to do, just not with the parallax, unless you invent a means of extending its range, and read only a single tag at a time.