v1 hook body works and can be attach with double sided tape not sure did not us it after finding that my kitchen shelves had a channel that's when I moved onto v2.

v2 doesn't use a magnet v3 does for the bodies, after getting v2 to fit found that my shelves were metal I had 11mm magnets, 12.2mm holes, 4mm deep so I added a slot, and they work perfectly. 

hole for hook is 7.5 mm friction fit for me worked fine. I printed the hooks with a diameter of 6 and the back as 7.5 being plastic I was able to fit it in tight. 

v1 hook didn't use.

v2 hook was used for the wire utensil.

v3 hook was for the wider utensil.