Looking to install the new Pioneer AVH-2330NEX with a Maestro Rr in a 2012 Mazda3, have some questions to ask! :)

Unfortunately crutchfield does not recognize the Maestro's support for Mazda3, but this document show that the mazda3 2010-2013 "retains steering wheel controls and adds gauges". So going off the build that is shown on crutchfield, I need to order the Antenna Adapter too as well? Also, does the Maestro Rr come with the wiring harness in order to hook it up to my car, or do I have to order that separately? I was also wondering if anyone had any experience with the Maestro Rr, and if it is worth to get over a regular steering wheel control replacement module. Thanks!!