Since greens usually slope back to front, finding a gentle slope facing the LZ is often the best green site. It is up to the designer whether to take it to the top for a "skyline" backdrop or leave it somewhere just below the ridge to recreate some earth backing to replicate (usually puny compared to nature) sitting lower in some dunes. Ross did this, as do most other architects. Better players tend to like some turf above the putting surface to delineate the exact back edge of the green, at least where possible.
That location also depends on the length you want the golf hole, and whether you are trying to balance cut and fill within the green site. If you are, the center of the green is usually about the same elevation as the proposed elevation. Sometimes, you raise it to get the bunker depth you want or drainage from above around the green.
Ally is correct that you prefer the ground to be sloping a bit left or right, in addition to the front. You can drain a green into a slope, but then it always needs a catch basin somewhere above the green. These can clog and run over the green which is never particularly desirable....Most greens drain out the front and then the back drains out to the low side.