Fail to prepare, prepare to fail. If there are 2 players standing over the freekick, cover both options, put extra men (from the front line) in the wall, then when the chance arises, row z it to reorganise everyone.
OR cover the posts, yeah strikers might then move into the 6 yard area, ind in front of the keeper, but all it takes is a nudge on the keeper and it (should be) free kick to us.
Unless its Roberto Carlos