Need Advice: Installing a Second SSD in iMac 27" (Late 2012)

Hi Lowyat friends,

About a year ago, I posted a thread asking for help on replacing my old, damaged SATA HDD with an SSD. Thanks to your advice, the upgrade was a success—so thank you!

Now, I’m planning to install a second SSD in my iMac 27" (Late 2012) and would love your guidance again. What’s the best way to go about this? Are there any specific adapters, cables, or precautions I should be aware of?

Looking forward to your expert advice!

Thanks in advance!