There are mods that allow you to display items, including weapons and armor, in transparent glass cases. There are also mods that allow you to rotate these items. But I haven't seen items that support directly placing weapons/armor on walls.
I have seen seveal mannequin mods that provide dress-up capabilities. Check out
this as an example. There are probably others, but I only found this in passing. I'm not really into mannequin display.