Good ways of securing a gun safe?

Hey yall, Im startin to get a good little collection of guns and am going to be getting a gun safe in the next couple of months. I have around 8 now and i know it will go up, however im in college right now and just want a way to secure them better. I know that when i get older and more settled that ill get a bigger one with all the bells and whistles, but for right now i just wanna get one of those 15 to 18 locking cabinets. My neighbor, and best friend just had 4500 worth of guns stolen. We feel it was a personal attack but you just cant trust anyone no more, and thats a shame. But i was wonderin if yall knew what i might need for one. I know a de humidifier but as far as if there are any tracking devices or anything like that, because my fear is that someone will just walk off with it all. And like i said i am in college so money def isnt floatin around or nothin, just want a little piece of mind! And also, i am rentin the house, so i cant bolt it to the floor, which is why i need some ideas. Thanks yall!