I don't want to repeat myself, so here are my posts on this subject.
http://forum.free-track.net/index.php?showtopic=466&message=3827
http://forum.free-track.net/index.php?showtopic=697&message=5320
And that's how my reflectors look now, after modifications mentioned in second of above links:
You can see that their surface is wavy - it happened when i heated up the tape, and it makes reflections visible from larger angles than flat tape
However only three LEDs probably won't be enough.