Not sure why a talk about "steering a boat from the right " and “propeller walk” are discussed simultaneously.
BTW, in the Navy we call it stern walk but then we call propellers screws. Stern walk is a handy feature on destroyers where you have two screws that turn outboard in a forward bell. You can ring up a twist (one engine forward and one back)at slow speed and get the stern to walk whichever way you want. At least that’s the way it was with steam plants. Current gas turbines use controllable pitch screws which always turn, always turn the same way (outboard in forward bell, inboard in backing bell), and provide thrust completely by blade pitch at slow speeds. Sternwalk is fairly negated on these platforms. On frigates where you have only one screw, stern walk is a bitch so you must get some way on and get the rudder to help asap. Bow thrusters and spring lines help distance the stern from the pier to give you a chance to get the rudder involved.
Anyhoo, the rudders are located abaft the screws and are neither right nor left justified. Are there civilian craft that have the propeller in the center and the rudder to starboard? Perhaps “right steering” refers to sailing vessels which, of course, don’t have propellers or none of any consequence.