I have displayed mine probably half a dozen ways. My top 3 favorites were:
3. Mannequin (looks great, just takes up a TON of space and needs an additional support stand)
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2. On some stainless steel peg board with other weapons. The stainless peg board is plenty strong, but you may want to mount in some wall studs. Also the pegs would tend to sag over time due to the weight and width of the smargun (the charging handle places a lot of the weight out on the tips of the pegs)
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1. Just on top of a ....thing. Not sure what you call those square hole shelves. That is where I have it now and feel it most secure without it being in the way. It is just there with other stuff and feels right.
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