Adding a monitored alarm system will help. Remember any safe is just delaying the thief if they really want in. Combining with a monitored alarm system where they now have to open it, or steal it, under time pressure makes a safe...safer.
I think the '30 minute' or '2hr' rating is a fire rating not a reference to any minimum amount of time for which the safe will exclude a thief. But, yes, layers of security are required. The best layer is a dog, Imho.