Agree with Jamie, for a lid 6mm Polycarb will be absolutely fine. Hatchet caught Reavers polycarb top a good few times at this years champs and it made a few dents and scratches but not much else, and LH doesn't really do anything spectacular either.

Spinners have no problems with it as i learned with Hatchet 1 ( 12mm baseplate, shattered into 3 pieces from 1 Mr Mangle hit) but as Nick said if you recess it so the edges can't be caught you should be fine.