Thanks; I'll take a look at these. I was hoping to find some where the anchor stayed in the concrete and the bolt portion could be removed specifically to avoid having to lift the safe over the bolts when they are removed.
As for the effectiveness of the safe, you are correct. In no way do I consider a safe to be my only security control. Any control can be broken or bypassed given enough time and resources. The safe is the last control in a layered defense. Environmental design, lighting, visible cameras, hidden cameras, alarm systems, average police response time, etc - they all play into a good security design.
I'm anchoring it down for 3 reasons:
(1) with the door open, it tips forward slightly when it is not heavily loaded.
(2) I don't want it to fall on a curious kid, and
(3) it adds time and complexity for an attacker to get inside, which allows time for other detective and response controls to hopefully work.