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And with the ongoing price drops and QLC NAND, if you like to use SSDs, you can mount these with four screws (included), you do need to take out that left side bracket. All pretty plain and simple stuff really.
Then just slide it in and secure it. Don't forget to put back that front side cover.
As you can see port 2 is connected to the 10 GigE infrastructure (purple), the NAS locks in at 2.5 Gbps (lighter purple'ish color). Always keep in mind that you need a 5 or 10 GigE switch as well in your infrastructure as well as on the client side (PCs) you'd need compatible ethernet adapters.