The bladder bag fits nicely on a Paradox Evolution frame. There are two hook and loop tabs at the top of the frame encasement that will fit through the three bar sliders and still stick back down securely. This allows for the bladder bag to slide down between the frame and pack bag and rest against the frame encasement.
For the Paradox roll top bag there is no other option to hang a bladder other than between the frame and pack bag or externally off the side of the bag. It will nearly always be external due to the roll top bag closure. If you have a snow collar pack bag then that may allow for a hose to exit and be usable.