Glass Touch glueless

Touch window according to the description and that works properly once in place.
For cons, the sticker would be welcome because not easy to set up by hand.
But above all, I had problem because the inside of the glass does not seem to understand protection as the outside, so that I have made lots of fingerprints and especially very difficult to clean adhesive residue and not fully, so I have a few small traces inside. Cool, right?