I was curious about the cargo cover, because I wasn't aware it was a thing on the CX-5. I went to check my hatch area, and sure enough, there's the space where it slots in, and the hooks on the hatch. I could totally put one on my 2019. AND, the way it's designed, it would fit along with the dog cage that I have attached to the rear seat headrests.
That being said, I don't think I need it. I feel like enough privacy is provided by the tinted glass, and I don't really keep much back there anyway.