Personal preference to upgrade to metal inserts & machine screws. Resource: McMaster Carr, 8-32 inserts and Button head Hex screws.
***Footnote: This is what Mike is referring to, (Refer to his comment below / Photo I attached too) about counterboring, prior to installing flanged metal inserts.
I like the clean look of the black button head hex head screws securing the M-165NQ Woofer.
I did a trail fit, and the speakers seat up against the baffle for a good seal. The grills clear the woofer indeed, I fabricated a prototype, prior to fabricating my final set of grills. Don't forget to factor in with the spacing, grill cloth tolerances too.