My wife just built me a back stop using a 3x4 kennel mat and 2x4s for the frame. My field points bounce off the mat. So far so good. I have it behind my black hole targets. She purchased the mat at tractor supply.

I made the mistake of mounting mine solidly. At 20yds I can get an arrow maybe 2" through and nearly have to put both feet on it to pull the arrow out. I need to let it swing a bit. I don't think it will wear out in my lifetime. Definitely get help hanging it if you aren't Popeye....they are heavy and hard to grip.

They work great Chuck. Follow the spacing advice as mentioned.