There is generally a simple solution here, though not all mount/ring vendors make it as easy as it should be. The simple equation is a function of the diameter of the widest part of the optic (almost always the diameter of the tube around the objective lens; sometime the sunshade tube is a bit wider); the distance that you want the optic to hover over the rifle mount base; and the center height of the rings over the mounting base. You have to ensure that the radius of the objective end of the scope is less than the center point of the ring/mount over the mounting base. As long as that is a positive number, you are good to go, but you want to optimize that positive number to be precisely how high above the base you want the optic to be.
It would seem that if there is a big difference between the objective end and the ocular end of the scope, you want the scope to be rather close to the base or you'll find it hard to get a cheek mount. If there is less of a difference, you have room to play with. But in general, as noted via others in this thread, keeping the scope relatively low to the mount will ensure that there is minimal offset between the eye view and the barrel view; it will be easier to pack the rifle/optic setup in a single-rifle carrier; it will be less likely that you'll need a cheek-pad to get a good weld when aligning your eye with the optic.
This is probably quite obvious, but I thought I'd mention it.
B