Some do, just as markers.
They all have Fret markers of some sort....as in a stripe across a fretboard......The ACTION is considerably higher with a Lap Guitar
It matters little.....I want to play Slide well, be it Lap or standard guitar, open tuned.
I've been listening to Derek Trucks.
https://www.youtube.com/watch?v=GBbRrvJt8G8
Hit's my soul ...![]()