Despite being headless, paddle basses suffer from neck dive due to placement of the neck strap button at about the 21st fret. There is also a tendency for the whole bass to sit a couple of frets to the left (RH bass) with that set up. There are several versions of strap extenders for these.
The 12th fret is accepted widely as the sweet spot to mount a strap button for basses with headstocks and sufficiently long top bouts.