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Whatever safe you get, try to place it along the wall that bears the floor joists, a bearing wall. The floor can take a much larger concentrated load at that point. It will also lower the deflection of the joists and hopefully make the floor less "bouncy". The standards under which this building was built should have envisioned people putting safes in their dwelling, as this is fairly common. The question is always how it really got built. Short of hiring a structural engineer to come out and analyze your building, a horrendous expense, you will never get a satisfactory answer to your question. I would not worry unless I saw a definit bulge somewhere after installing it.
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