A common problem with glass screen protectors is trying to find the perfect balance of fit and finish. If it doesn't cover the entire screen buyers complain, but if it does, cases can peel them up and ruin your screen protector. It's hard to get one that does both and fits good.
Some new protectors from Jyline on Amazon are case-friendly and full of positive reviews. You'll get three tempered glass protectors that work with a case. Each piece of glass is extremely strong, scratch-resistant, and won't get covered in fingerprints.
Each piece of glass is cut perfectly so it covers the entire screen but has a small 1-2mm of space on the side so you can still use a case with the OnePlus 5T. Just know that if you install it without a case, it will almost look too small. Keep that in mind.
Buy it Now for $7.99 on Amazon