Where can a holder legally place the ball for a kick besides a legal tee?

The holder can legally place the ball on the ground for a kick, which is the correct answer. This practice is common during field goal attempts and extra point tries when a player serves as a holder, crouching down and positioning the ball for the kicker. The ground provides a stable and level surface, ensuring that the ball is set properly for a successful kick.

Additionally, other options are not permitted. Placing the ball on the sidelines moves it outside the field of play, negating the opportunity for a legal kick. Using a teammate's hands would also be unconventional and could result in a penalty, as the kick must be made from a secure position. As for placing the ball on an official's foot, this is not a recognized or legal method within the rules, and doing so would likely lead to confusion or disruption during the game.

Thus, using the ground is the only recognized and legal option for a holder to set the ball for a kick.