The GGS protector is on both LCDs on my 6D with no bubbles. <$9.00 shipped:
Thanks, if you manage to apply it correctly, I'll try too ... though also on the link you provided a customer review says something about bubbles on the 6d?
One drawback though is that a small bubble runs across the center of the small protector. This shouldn't affect me since I use the viewfinder and the large back display when checking camera settings.