i use haybales. i got 8 of them in a stack...2 high and they form a 90 degree angle...i put my target in the open end of the angle...
heres the best pic i got...only 6 in there at that time..
its now 2 deep x 2 high..i keep them on pallets as you see...keeps them off the ground....keeps the mice out of the shed
and keep them covered with a old tarp i had laying around. they lasted a full year and still goin strong.
also...it does stop my arrows. sometimes ya gotta dig for em...but i havent had one go through yet...alot of mine are broadheads passing through my BH target...but i'll admit...a couple times i was tired, shakey and choked and punched the trigger and threw them into the hay bales...