Create a Corridor into the Corners
This is a workable but complex solution to the common problem of purely perpendicular targets in corridor resolution.
Both an intermediate surface (from another corridor) and Assembly Offsets are employed in the workflow.
You have to ask...What if you change the design plan and employ Offset Alignments, Slope Controlled Profiles, and Widenings?
Regions and a few added Frequency stations are required.