Regarding CDs/DVDs/BDs, I think there is still the issue of potentially being too big,
I'd just place the object near (or in) the central hole and macro focus in on the hole and object.
Chose the right angle and you can have whatever seems relevant reflected in the CD as a background; or simply isolate the object using depth of field.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.