I've always made my own wall hangers using those heavy duty took hook from home depot screwed into an oak board. Those tool hooks are rated to hold 50 lbs. They also have an slight upturn at the end and vinyl coating so nothing slides off. I used oak since it's strong/dense enough that I knew the screws wouldn't pull out from any weight on them. I had my guitars hanging on those for a decade with no problems before switching to the double decker rack I made. I don't know if they'd react with nitro, but haven't reacted with any other lacquer or poly finish my guitars had.
Have a length of oak long enough to span and screw into the wall studs. Then another oak block screwed into that with 2 screws plus the tool hook. Basically you want the wall board + block(s) to be thick enough so the tool hook only screws into the oak and doesn't poke into the drywall. 1-1/2" to 2" total thickness is enough. Additionally it makes it sit far enough away so a tilt-back headstock or the body won't bump the wall.
Additional Edit... At $2 each they're a shit tone cheaper than anything else and in my opinion much stronger.
These are the tool hooks I used:
Home Depot Tool Hook
Not the best, but here's a couple of pics
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One more edit: I found a better picture that shows how the hooks are mounted with multiple guitars. The 2nd row shows the blocks mounted, but without the tool hook screwed in.
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