The installation is a bit more difficult compared to others, but because it covers the back of the phone (like ears on the left and right) which I consider very clever as an application to prevent easy detachment due to the curvature of the screen, because the case "seals" the membrane. The installation was done today and the case is OEM, so I will only come back if it starts to detach immediately. Let's face it, there is nothing permanent in any device I've had, especially in the P30 Pro which has a curved screen. If it lasts me 7-8 months, it will be perfect. P.S. The functions work fine (fingerprint, etc.) and it does not affect the screen colors.
Update 20/05/21
The corners are starting to detach while using a permanent case (all four corners), so I will proceed to purchase another protective one with adhesive. I hope to have better results there. In the end, it didn't even last a month... it's a shame because I liked its logic.

The worst. I managed to put it on after a long time without bubbles and the result at first sight was beautiful. I open my phone and I thought I had a different screen. Like a blur. I try to put it in the case (spigen) and the membrane kept peeling off constantly on the corners as it came into contact with the case. I took it out of the case and left it for 12 hours in case it needed to stick better. Same thing. Like it's blurring the screen and the case is peeling off. The worst. The well-known store where I bought it, I had told them that I was afraid to use a case because the membrane expands to the sides, and they replied that it expands to help with case usage.

I haven't found anywhere the same quality as the factory membrane of the P30 Pro when it came to clarity and durability, etc. If anyone knows, please tell us!!!