Fitted to aft sloping rails. The foot at the bottom is on the deck or coaming.

Fitted to vertical rails. In the illustration on the right spacers can be added to move the vertical further outboard, even mounting the foot on the transom.

Fitted to sloping transom with pushpit rails leaning outboard.

Fitted to transom without pushpit rails. Alternatively, the C-bracket holding the yoke can be bolted
directly to the transom instead of clamping to the vertical tube.