I am building a new desktop PC using an SSD as the main drive. The case provides a spot in the back of the case (effectively behind the power supply) for mounting an SSD. See attached picture that show the location of the mount. As you can see, since it's behind the backplate, I suspect that there will be considerably less airflow back there, but it will free up one of the drive bays.
Should I be concerned about this? I suspect the airflow won't be any worse than your typical laptop, but will it affect the life of my drive?