Then you want one like the Dean in the picture. They've got little dots on the side where the fret would be for 3,5,7,9,12 etc. -- the same frets that have mother of pearl markers on an electric bass. You can see them
here. See the little white dots on the side? That's your virtual fret.
I'll be selling mine eventually, but probably not until next spring or summer when I get completely moved over to the big dog.