Welcome to community @JLedbury If you have a 2.5" bay empty it's safe to install a SSD there (or HDD for what matters). As for specs, don't worry. Pick any SATA SSD and plug it. The SATA standards are build with backward compatibility. In other words, if it fits, it works. Pick any SATA3 2.5" SSD according to your budget (try to stay under 4Tb capacity to avoid further complications) and keep in mind that over 80% usage of space affect the performances. Also pick a merchant which allow full refund in case you have any problems (stay away of ebay). Cheers.
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