Congrats on your PT 111 Pro! One can't go wrong with it. Mine is a very accurate piece but came with the factory 3-dot sight configuration. I just ignore the rear dots and concentrate on the front sight post for accuracy, always keeping in mind that point of impact is covered by the front dot. The top of the front sight needs to be level with the tops of the rear ones to get the bullet to hit whatever is behind the front dot.
Happy shooting and stay safe! And plus one on the PT 111 Pro probably being the best 9mm CC pistol out there.