Obviously it's going to be bolted, a safe that isn't bolted is useless and a waste of money.
All gun safes here HAVE to be bolted and securely fit.
As for "Guns are cheaper than the safe", well if you're spending 200 dollars on a gun it's either cheap tat or well beyond second hand used. That safe holds 6-7 rifles/shotguns. If you're unwilling to pay that much then by a smaller one and have fewer firearms.
Keeping them safe should be a requirement.
A safe and an alarm blaring is enough to send most people running, the only people that would stay are the idiots that will most probably get caught by the police.
I've seen this video and Tom from that channel is retarded. That video is good, but it doesn't prove anything.
The safe I linked is certified by the police here to be sufficient. Try and get leverage on a safe in the corner in a cupboard or whatever. You make it sound like you can just pull it off the wall, set it down and get a good amount of leverage on it...
How many people would want to go to that much trouble if you have an alarm drawing all the eyes on the street to that house and people probably already dialing the police? Criminals don't want to get caught, yano?