Like said above, 1 jack stand 1 freestanding cement deck footing and a 4x4 towards the front of the safe. Little prep work, infinitely adjustable and easily moved should you move the safe.....don't forget to bolt it through a support underneath.
I'm in the same boat as the OP. My plan is to get in the crawl space and build a frame and fill it with concrete, essentially building my own slab directly under the safe, then secure it as normal.
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