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I would think that plasterboard adhesive is designed to be minimal slump. As you dab amounts onto the wall, you want it to stay there, not dribble down the wall.
This means, if you are using it on a horizontal surface, it will not self level. It will also not have free flow under the weight of the marble hearth.
Also it will not have been designed to offer any flexibility when cured.
If you are confident that you can lay the plasterboard adhesive level enough to support the entire surface area of the hearth, and can position the hearth without dusturbing this bed of adhesive, continue with your plan.
mespilus
SteadyCam
Think I'll be ok laying down a marble hearth with plasterboard adhesive?
The internet recommends mortar or tile adhesive but I have a half used bag of plasterboard adhesive I want rid of.