As above I’ve got spigen screen protector at the moment.
It seems better than the cheap ones but time will tell. I bought cheap ones for my last phone and they would lift slightly at the edges and end up being a bit unsightly.
The current spigen one is a straight piece of glass with no holes for the front camera or shaped edges so maybe that has something to do with it.
It comes with a rectangular clip on mounting frame as well so it’s easy to get it on straight.
Don’t stress about air bubbles too much.. Get the worst out by massaging the screen and and really small bubbles seem to dissipate over the next few days.
Just follow the instructions and it’s dead easy… The key thing is not to get any dust trapped so do it in a clean and calm environment.