Most Mazda manual transmission models can be towed flat but check the owners manual to be sure. If you only want an automatic, you will have to tow on a dolly. Not my first choice but if you really need space for six passengers... Also, there may not be a baseplate available for this model.
If you really can get by with five passengers, then the Honda CRV would be my first choice as it can be towed 4 down with an automatic transmission.
Also, you should look at Ford and GM, some of their smaller cars can haul six people, are light, and can be towed 4 down with an automatic.
Roger & Mary
2014 Tiffin Phaeton 36GH
2012 Honda Fit toad