I would put it about half an inch to three quaters of an inch off set to the right.
Measure the transom from chine to chine and get the centre line of the transom, then measure the offset.
Make sure you get the height right as well, The Cavitation plate (the one above the prop) should be in line or just below the bottom of the hull.
Then before you drill the transom check your measurements again!!.
You can buy transom drilling templates but you might get one with you engine as its brand new.
Drive it like you stole it!