Just zero your laser at the max range you will use the laser with the optical sight you are using.
At the barrel it will be at max offset which is the distance it is off center from the bore 1 to 2 ".
If you zero it at 300 meters with your scope, at 150 yds it would be 1/2 the offset so 1/2 to 1" to the left or right depends where you mounted the laser on the left or the right side of the barrel.
At 600 yards it will be off 1 to 2" to the opposite side of where you mounted it (because it has crossed the zero plane) plus the bullet drop which has not been addressed.
Using the laser will get you within a couple on inches either way when adjusted to the longest range you will use it at.
Remember a laser travels in a straight line, the bullet starts dropping as soon as it leaves the barrel (gravity has this effect on things).
It appears to rise to the scope because the barrel is tilted upward to zero the rifle at a given range say 100 yds.
The bullet will impact at 100yds you can adjust it for rising or falling depending how you sight in the rifle and how high the scope is above the barrel.
For a bullet and load that has a big drop or arc the higher you mount the scope the better, as this will give the best look down as the bullet is dropping( keeps zero longer).
For flat shooting rifles the lower the scope the better as you want to keep the bullet path the same as the optical path to keep the bullet and the scope zeroed the longest.
Same applies to a laser, closer to the center of the bore for flat shooting rifles the better and a higher mounting for arcing bullets.