Just buy a Sturdy Safe.
7 Gauge Steel with a 14 Gauge Steel Inside wall to compress their fire liner
If that is not enough, then maybe some standoff, reactive armor off a surplus MRAP or M1A1
7 Gauge Steel with a 14 Gauge Steel Inside wall to compress their fire liner
If that is not enough, then maybe some standoff, reactive armor off a surplus MRAP or M1A1