Anchors are the way to go. Look at the pull out rating for each option you are considering (compare same bolt diameters) and you will see why anchors are stronger. The exception might be some of the epoxy grout solutions, but those are more complicated than needed.
And don't underestimate pry access and tipping access limitations...those can be just as important as bolting down. And keep in mind, many safe break ins are accomplished via cutting sides or tops.
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Last edited by Jeepergeo; 03-13-2018 at 12:03 PM..
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