If you have decided to use a screen protector, take a look at the ones ESR offers.
They are tough, they are highly transparent, they are easy to apply, they are cheap, they are 0.3 millimeters thin, they are fingerprint resistant and they have a very good fit for the iPad.
If you follow the accompanying instructions and apply the screen protector in a dust free environment, you should get a very good result with no air bubbles. I applied them in the kitchen instead of the living room. There are many more fabrics that can cause dust to circulate in the air in the living room. If you don't have a dust free room you can probably do it outside when it's not to windy or cold.
I have used ESR screen protectors for iPad Pro 10.5 as well as the iPad Pro 12.9. I am very satisfied with both. Before I began using screen protectors I was afraid they would make the screen less responsive to touch. I haven't experienced any of that.
I paid 6.29 GBP for the 10.5 inch and 8.89 GBP for the 12.9 inch, both on Amazon. ESR screen protectors come with a lifetime warranty.