This is a docking station for the TI Nspire calculator. I've currently mated the top case pieces with the mid frame, but not the bottom case. I can mate the top face of the bottom case with the bottom face of the mid frame, but I still need to align them along the X and Z axis. I figured I could use the two reference points, but it's only letting me select one or the other. I'd like for the points to be on top of one another via X and Z, but still be separated in terms of Y, since that's handled by the face mates.