Three of my fretless basses are unlined, two are lined (don't ask, I have been playing for over 50 years... one owned from 1978/9) I prefer unlined, lines are no problem, but for me, the side dots have to be at 3,5,7 etc. not in between as fretted ones are. The bass I have owned from 78/79 has a novel arrangement, there is a dot at 10, not 9. I only noticed that after about 44 years of owning it, go figure!