Difficult application but someone with experience can achieve very good results. The fingerprint function also worked seamlessly.
The issue with these specific screen protectors is the adhesive.
In case it doesn't fully polymerize and runs onto the phone without you noticing (as it happened to me last time - note that I have used similar screen protectors at least 4-5 times over the years), the adhesive is so corrosive that it breaks down the phone's adhesives.
In my case, besides the corrosion of the adhesive on the back glass of the phone (the back glass completely detached), it also penetrated inside the phone's screen (presumably loosening the adhesive between the screen and the metal frame), resulting in the death of the phone's screen at the point of penetration.
From a screen protector, I ended up with a €300 screen repair.
I wouldn't recommend them even to someone who knows how to install them.

It was installed with great care and for a considerable amount of time. Unfortunately, the adhesive does not work well and the excess dirties the phone, resulting in poor application. Additionally, the UV emitting device is of very poor quality, sometimes it works and sometimes it doesn't, resulting in the glue not hardening properly and leaving gaps either on the side or in the middle of the phone. As for the fingerprint, it works quite well and after a fall that the phone had, it was perfectly protected.