on wedge, can we apply at the previous spot with 15 yds?
Yes, it can be if Team A is in possession but they'd be clinically insane to accept this penalty. From the memo last year.
2010 Rule Change: Wedge Formation on Free Kicks
Rule 6-1-9 (FR-88)
Illegal Wedge Formation
ARTICLE 9.
a. A wedge is defined as two or more players aligned shoulder to shoulder within two yards of each other.
b. Free-kick down only: After the ball has been kicked, it is illegal for three or more members of the receiving team intentionally to form a wedge for the purpose of blocking for the ball carrier. This is a live-ball foul, whether or not there is contact between opponents.
c. Formation of the wedge is not illegal when the kick is from an obvious onside kick formation.
PENALTY-Noncontact foul treated as occurring during the kick. 15 yards, spot of the foul; or 15 yards, spot where the subsequent dead ball belongs to Team B if this is behind the spot of the foul. If the subsequent dead ball belongs to Team A: 15 yards, previous spot with the down repeated. [S27]