I live in an intensely deer and other game hunted area. I have two each 1000 gal propane tanks. They are in a pit with three high sides. low side drains to a pond and is not likely to be the direction a shot would come from. The round end is the part of the tank exposed at the open side of the pit and is harder to penetrate.

Tanks have been known to pop off an end cap but other scenarios are much less likely.

Pat