  We consider simple dark matter extensions of the standard model in $Z^\prime$
portal scenarios inspired by grand unification theory constructions and we
study the phenomenology of such models by considering Spin Dependent and Spin
Independent direct detection constraints, confronting the canonical thermally
produced dark matter scenario and we show that in this simple framework the
combination and the complementary of these constraints is a powerful tool to
derive stringent bounds and to reduce the viable parameter space of the model.
