I didn't know your existence until now and hell it's totally my loss.
I've browsed your site, and the price on those gongs is really competitive. I wanted to get a few of those "Knock-down" ones and I wonder can I just place those on a level ground without them falling (with some sort of back support if needed).
I wanted to place them both 100 yards out for rifle shooting and 7-15 yards out for pistol shooting. My idea is to spend money getting as many steel targets as possible at the moment.