Nowhere does the new rule specify the mandatory plane goes toward the tee. The direction of the mandatory plane is defined by the TD.
On hole 7 at my home course HB Clark designed the hole using the Mando tree as protection from hole 6 fairway and baskets.
If protecting that area (to the left from tee to tree) is the intent then the TD should be obligated to place the plane from tee to tree.
I know it's at the discretion of the TD but where else could the plane be drawn?