I can't speak for ski's, but here's a couple of photos that may help. The first is the back of my '23 with captains chairs
*and the rear seat removed*. As you can see, the CC come with a floor mat for the space between the chairs.
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Here's a photo of my size medium 29" mountain bike upright in the back. It fits very easily with the third row out, and would fit with the 3rd row present.
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I normally carry my bike on a 1up rack, but may have a need to carry it inside away from prying eyes. I still have the old mount I built for my last (Ford Escape) company sled, pictured below, and think I'll adapt it to my GX.
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Mark