Even if you have no reason to believe that anyone in your company should ever have a reason to touch your servers or attempt to access them against company policy, you should have a way to lock them up a safely, such as a server cabinet with locking doors. As opposed to server racks, most server cabinets have doors on the front and full side panels.
Even So Your New Server Rack Needs to Be Able to Breathe
Since you are planning to install your servers in a server cabinet instead of rack, you must be mindful of the fact that your servers must be able to breathe. Having plenty of cooling air is vital for the life of your servers as they generate an amazing amount of heat, especially if they are under a heavy load. Check the specifications very carefully before you order your new cabinet to avoid the risk of burning down one of your servers.