The best way is to install the knob or pull near to the hinge- edge of the lst door ( leading door ).
This takes less effort, since Bi-fold doors are folding doors, and this placement helps the roller roll easier, since the roller is being pulled along the track.
Bifold Doors are Doors that are hinged in the middle and fold in one direction. They can also be in pairs with one pair folding to the left and one to the right.