Autographs on blu-rays

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I wasn't sure where the proper place would be to ask this, but collectibles sounds like a possibility so I hope I'm posting this in the correct forum.

My question: As far as collecting goes, is there a preferred place to have an autograph signed on a blu-ray? For example, is it better to have an autograph on the cover itself, an inside booklet, or maybe the disc itself? ... or someplace else that I'm not thinking of? (... or maybe not at all)?

Thanks in advance!