Chopping Boards tend to be LDPE (IIRC) but it is still usble, but it might worth seeing how much some HDPE from direct plastics will cost compared how many Chopping boards you need.

HDPE doesn't hold treads well plus it doesn't glue well either.

The ways i have seen it uses is either using screws or bolting it through either into metal struts or into threaded inserts