This is the same as the 3 Notes Per String concept, except that it is er... 2 Notes Per String.
The phrasing you get as a result is different, and the finger choices, too.
I might say that 3 Notes Per String is good for Metal and 2 Notes Per String is good for Gypsy Jazz. It's up to you really.
A good starting point is to use only the 1st and 2nd fingers.
Then add in the 3rd finger, depending on what you want to achieve.
- The first diagram is the Major scale starting from the Root Note.
- The second diagram is the Major scale starting from the 2nd Note
The shapes are key agnostic, that means they apply whatever key you are in.
All that gets in the way is the fretboard length, where the fretboard start and ends for the key you are in.
- Starting in the key of G, on Root, means that you run out of fretboard quickly.
- Starting in the key of G, on 5, means that you have more fretboard to navigate the entire shape.