Remember, when you are securing your servers and server room, always get good quality equipment and resources, including even smaller things like a hinge for a server rack. Servers are generally incredibly important for whatever company or person is using them as they are where data for all manner of things are stored. Sites, gameservers or important information may all go down or even be lost if it's not all properly protected form both burglars, weather and environmental hazards. For while rain and such wont likely be reaching into a secluded room, you can still end up with destroyed equipment through lightning storms, harsh weather and sabotage. Even something as simple as a strong hinge for server racks can do more than any alarms or cameras can do in terms of protecting your server room. So remember to never be cheap with your purchase of equipment needed .
Outside of hinge for server racks, you also need various things, both smaller and bigger, like handles, sealing profiles and locks to help keep the servers secure. For even if you keep the door locked, someone can still come in and you also want to ensure that in case of earthquakes or any other extreme natural phenomena will not damage anything, or at least make it more difficult for damage to happen. But regardless, make sure you use a supplier that you can trust, one that you know can make high quality items that fit your needs as well as requirements.