As long as they are not the polystyrene type backed ones henry they are screw only, pink or yellow solid foam ones d&d them then they should have fixings put in but I've been on loads of sites where they haven't put secondary fixings in and they've not had probs
the only boards you cant dab are the ones with foil on the back, with boards that have insulation on you need to put 2 nailable plugs in, as a secondry fix.
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