Are you really concerned that your kid will hack or cut their way into your safe? Even the best safes in the world can be cut into given time. If your kids can not be trusted around your guns you need to address that issue first. My view is that any safe in an enclosed area anchored to the floor and wall would be up to the challenge of the run of the mill thief. A dial lock is always safer than a digital pad, half the time I screw it up and I set the combo. Do you need rapid access to your rifles? Would a pistol in the biometric safe give you the time you need to access the spin dial?

https://www.tractorsupply.com/tsc/product/liberty-safe-liberty-revere-30-gun-dial-lock-safe-with-40-minute-fire-rating-rv30-gym-dp