Backstop for shooting inside your house?

Would a single horse stall mat hanging be sufficient to stop a rogue arrow?
I have one laying around and it's unbelievably heavy and awkward to lift.
 
I shoot in the basement. About 11 yards. No backstop aside from the concrete slab behind the drywall. If I completely miss a Block target I deserve to lose that arrow. Spackle takes care of a 5mm hole in the drywall.
 
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