Securing servers and making sure that no harm can befall them through things like a latch for server racks to make sure they're held in place and less risk of accidents that can cause damage to them. Anyone who works with servers know just how important it is that they stay up without interruption. Some even see it as a challenge to keep servers going for as long as possible without interruption and there's people boasting of servers running for decades if not longer. But even if you're not the type to boast, having servers up with as few interruptions as possible are important, especially for saving and storing data. The latch for server racks is not worth being cheap with, they're important to keep safe, not just from accidents but from thieves and people who have no right to get their hands on your servers.
Spend rather than save
Security and safety are never worth "Saving" a few extra bucks for, you're going to be using the server and whatever you buy to keep it safe for a long time after all, so why risk thousands of dollar worth of losses to save a few initially? So, buy yourself a proper latch for server racks and make sure that what you got is kept secure, to ensure that it can keep running no matter what. Spend money wisely and buy high quality, that's sturdy and at low risk of breaking easily from outside force. Your servers are worth it.