It won't help you much now but the secret to getting those bolts out of the way is to drill all the way through the slab before you install them. When you want to get rid of them you just drive them down and plug the hole.There's was just enough room to get an drill on them to tighten them down in the corners. I used sleeved anchor bolts to secure it to the slab. When those bolts tighten down they flare out and are designed to be permanent.
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Luckily, I have no immediate plans of moving, so right now it's not an issue for me, lol.