I have a 16' Lowe and I use one drift sock secured mid boat. As long as the sock stays out of the way of your fishing lines you can use it without any rope. Extra rope can be added to get the sock farther away from the boat if needed but if you get the sock too far from the boat the boat will not drift straight. Too far out and the wind seems to move the front of the boat more than the back or vice versa. Best to just try it on your boat and see what works and what does not.
To make life enjoyable, you must have crappie days.