Thumb Score: +1

The Galaxy S23 Ultra has curved screen edges, so like most phones, most would agree that the best* screen protector will be a tempered glass that uses a Liquid Optically Clear Adhesive (LOCA) application.
It looks like there are currently three options on Amazon.com, in order from lowest to highest price:

1. Akcoo, 3-pk $ 19.99 (possibly $ 3 coupon)
https://www.amazon.com/dp/B0BQDWH55G
I’ve never heard of this brand before. It does NOT include an installation frame but does include everything else (glass, LOCA, port stickers, UV light), so installation is a little trickier.