Are you experiencing overheating? Or just want another fan because why not?
Looking at the product page they don't include an exhaust fan, so yeah placing a fan to push the hot air out the back of the machine may help, most likely it won't change anything.
I personally use Noctua fans, this one would be suitable for an exhaust: https://www.amazon.com/Noctua-NF-F12-chromax-Black-swap-Premium-Grade-Quiet/dp/B07654PNFQ/ref=sr_1_1_sspa?keywords=noctua+fan&qid=1550870352&s=gateway&sr=8-1-spons&psc=1