Hey Andre,
I'm in Ontario, too, and have thought about this...I suggest you poke your head under your CX-9 and take a look at how accessible the undercarriage is for spraying a Krown coat (or similar). There are a series of panels and covers, made up of a sound deadening material...probably also helps with aerodynamics. Unless your installer (or you) are willing to carefully disassemble these covers, I'd guess you will not be getting a proper treatment.
I did vehicle spraying as a side job in college, and it's about turning the cars quickly. Taking the time to remove panels is not what they want. I'd guess the installers would get their skinny wand, jam it strategically under panels and give a squirt...knowing you will not disassemble things to inspect the job.
As for the doors and rockers...It's a toss up: The protectant can help in these areas, but they usually need to drill holes in your shiny new truck.