I too have seen a few homes, including real estate listings with a SxS shotgun as a wallhanger, no idea what mods were made to them if any to make it legal, but you virtually have to destroy the thing.
See here:
https://goodblokes.nz/displaying-fir...-collectables/
Generally most people appear to be just removing the firing pins and perhaps welding plugs in the chambers which is not considered good enough as far as I can tell, see above link.
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