The first thing you'll need to flat tow your 2015 Chevy Malibu LS is a base plate kit like the Roadmaster part # RM-523178-5 that is a confirmed fit.
In addition to the base plates, you will also need a compatible tow bar, safety cables, lighting, and supplemental braking to flat tow your vehicle. The most popular compatible tow bar is the Falcon All Terain, # RM-522. This has non-binding arms which makes the setup very easy to connect/disconnect.
For lighting/safety cables, locks, and... view full answer...