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Plop is a great simulation tool.
If allowing for refocus, 6 points are generally better than 9. Just arrange them equidistant at the 58% radius zone.
I can recommend 6 points. Provided the back is flat you can also use a continuous ring support instead of 6 points ( ie Silastic or Velcro ) . My 14" F5 X 1.5"thick is attached by a continuos ring of Velcro and holds figure and collimation excellently, and no clips to cause diffraction effects.
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