Unlike the 2006-2010 Mazda5, the 2012+ redesigned Mazda5 does not have a hatch-integrated rear spoiler. That means you can easily add one if, like me, you purchased the Sport trim that doesn't come with one. I don't have a good picture of my own but I found this on Edmunds to give you an idea of what it looks like:
You can see how the spoiler attaches to the top of the rear hatch. There are already several companies that have spoilers ready to purchase and install. I may go for it on mine; I regret not stepping up to the Touring since the main reason for getting a Sport is the manual transmission, which I didn't get.

You can see how the spoiler attaches to the top of the rear hatch. There are already several companies that have spoilers ready to purchase and install. I may go for it on mine; I regret not stepping up to the Touring since the main reason for getting a Sport is the manual transmission, which I didn't get.