Me, few times I got a scope cut.
Come to think of it, with rental guns only.
Later, I developed procedure for unfamiliar guns.
Brim of baseball hat.
Brim must touch the scope rear lense.
Then i know i am approximately good with my eye releif, and after that I make final positioning of the eye before taking a proper aim.
Under adrenaline, tired, under sweat, and during the hunt, this is very soild guidance for adjustment the eye releif with unknown rifle.
On the range session, without adrenaline shot i focus on proper sight picture without side shades to establish proper eye releif.