I make a lot of vertical slab type jigs.
I always rig mine assist style and that helps a lot when vertical jigging them from getting snagged up and losing them. It also does great on hooking the fish.
Attach your line to the solid ring on top. So the hook is on the top.
I hang mine from a rack made from 1x2's with a piece of all thread going across near the top.
I hang the jigs from hooks on the racks and the threads of the all thread keep the jigs from sliding on the rack once I hang them.
I don't normally epoxy coat mine but use powder paint and a powder paint airbrush then a clearcoat of UV blast powder.
The eyes get a coating of D2T to hold them on.