If you are comfortable that your rail is square vs the receiver just use a feeler gauge or similar between the rail and the flat at the bottom of the turret assembly to ensure they are square and do the screws up. You could even use a deck of cards if you don't have a feeler gauge laying around.
WAAAYYYYY easier, faster and I would argue more accurate than using levels etc.
Just remember to remove the gauge before you finish tightening the screws or something might give way.
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