Better than having a threaded rod sticking up is threaded inserts. Cast into concrete.
https://ramset.co.nz/product/threaded-insert/
There are other brands also but with a hole in base to pass a R6 bar thru for extra anchoring. Bolt to a board just big enough to support them securely, spaced and placed to suit the safe's holes and attach to the boxing edge before pouring or puddle in during pour. Easy.
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