Using Matte Box With Wide Angle Lens on XL1S

I am using a CA Vision .6 Wide Angle Lens on the front of the 16x Auto XL1S Lens. I have been looking at getting a bellow type matte box like the Lee Filters, or Optex ones, but am concerned about vignette occurring. I understand that the bellow type matte box is supposed to be better in controlling flaring problems than the non-bellows type offered by century optics and others? Is this true? And what about Vignette problem occuring?

Thanks

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