Placement of the tabs on the housing isn't critical. You can put them wherever they need to be. You just wanna make sure they land directly under the arms. A good way to figure out if they should be on the front, top, or back of the housing is to just put them wherever they make the vertical link bars vertical. You don't really want the vertical links leaning to the front or back, try to get them perfectly vertical. Wherever they end up vertical is where you should put your tabs on the housing.