The floor is at least 8" of concrete, 5 of which I had poured 3 years ago to level out the garage. The tank is 14,112 square inches, so you're talking about 2.16 lbs. per sq. inch.
That's like a 311 lb. guy standing on a 1 foot floor tile. If you could stack 98 of them, I doubt seriously it would crack the concrete.