Hi I will be putting my PJ up in the next few days, and I just checked the area tonight on were I will put the PJ and its very hollow, as its just plain plasterboard. is it safe to attach my Projector which only ways 3.2 kg, to plasterboard ?? If so is there any type of special screws I can use to make it all a bit more secure ?? + I am guessing here but would you recomend putting a peice of wood beween the mount and the ceiling ??? any tips is apreciated to the max !