Fiducial on non-rectangular board

Where should fiducials be place on a PCB that’s not a rectangle (mine’s like a “T”). Can I just place 4 in the four farthest corners?

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We will take care of the fiducials as they are automatically output in the CAM data. Their size and location is part of the process files for the machines that use them for alignment like the Vision Routers.

Three fiducials well spaced are enough, even on “T” shapes.