Final answer:
Rollers should be placed in the middle but closer to the base for the least amount of volume, as this location prevents the creation of lift at the roots and results in smoother hair.
Step-by-step explanation:
For a roller set where the least amount of volume is desired, rollers should be placed in the middle, but generally closer to the base of the section being rolled. If the rollers are placed near the roots, it would create more volume at the scalp, which is not the goal in this scenario. By placing them in the middle, closer to the base, you encourage a smoother result with less lift. This method ensures that the hair is more stretched out and does not have the foundation to support volume at the roots.