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If the screen is flat it's not an issue, just make sure the case is screen protector friendly which leaves gap so doesn't touch the screen protector
I currently have OnePlus 13 with it's micro curved screen so for glass protector it's looking like need to go with UV Tempered Glass Screen Protector
You can see the Tutorial video below
OnePlus 13 UV Tempered Glass Screen Protector Installation
OnePlus 13 UV Tempered Glass Screen Protector Installationwww.oneplus.in
Really is a shame the OnePlus 13 curves aren't subtle enough to get away with using a regular tempered glass!
I always put one on my phones and always scratch them somehow. Never put my phone in pocket with keys etc. I can live with a scratch on protector, but if it were on the screen I'd never unsee it!