I'm basically a fretless only player and have been for at least 2 decades a fretless only player, so I'm interested in fretless whatever style it is. And I'm no fretted bass player, I even can say that I'm not liking playing fretted instruments.
I listen to any kind of music as long as it's music, and metal is music.
It's not an odd position at all, but to me, the only fretless player in metal is Steve Di Giorgio who is almost unknown outside the metal nor fretless world. His playing is, to me, hallucinating, but burried in the mix, very strange for the guy who almost invented the death metal genre !?!
Playing fretless on a tune or two doesn't make you a fretless player as, most of the time, you are playing just what you played on a fretted bass on a fretless.
In your list, you can add Svante HENRYSON who is basically a fretless player, but played fretted bass because of the music he was in. He is also a terrific double bass player.
And what about Jack BRUCE who has been playing fretless metal bass even before the genre was ever named...