Will the Compresses Carpet target accept Broadheads or will that wear it out quickly? I imagine if needed, you could take it apart, remove the middle pieces and add more if needed.
On the question about the Horse Stall Matt, I gave one to my little Brother for his basement. We Lag Bolted a couple 2x4's on each side along the top, added some big eye bolts across the Top and hung it from his Rafters. the Bottom swings freely and all field points Bounce off. We shot Broadheads into it to see what would happen, the penetrated but it still stopped them. I think it makes great Backstop material.