No experience with these dropouts, but surly’s use a through-axle with their sliders:
https://www.reddit.com/r/Surlybikefans/comments/o9u878/axle_slipping_with_horizontal_dropouts/
I am still looking for an application for these fancy diamond coated 3M friction shims. They make an M12 shim that is 13mm ID and 20mm OD.
They sent me some free M8
samples: