The Samsung Galaxy 10+ comes out of the box with a factory installed screen protector. No need to install another one. you will never get a third party screen protector on the phone without bubbles.
I use this with the Otter Box Defender case. I did find that I needed to very slightly trim the screen protector very slightly so it did not lift up. This was not a big deal. Did it on 2 Galaxy 10+.
Remember the 10+ has a screen with rounded edges. It is extremely hard to install a screen protector on this type of phone so I was thrilled that this was factory installed.