Yes, @Elley Mae, in a previous thread, perhaps early in T8 or late T7, we discussed this at nauseum with rotated images, in fact, of CR-Vs to see what that space might look like in an upside car. The most important factor some of us honed in on is whether the middle rear seat head rest was up or down. If it was up, the space between the head rests of the back seat and the roof of the car was very narrow - IIRC, something like 8". But if the middle head rest was down, it would make it easier for a body, live or dead, to navigate into the rear hatch area, IMO. It may be worth you going back to review that.
And I don't think any of us were able to find an image of KR's CR-V that would indicate if she usually had the middle rear seat head rest up. An OP did mention that those head rests are a bear to put back down. So once up, they may stay up.
Now if anyone can find such an image, that would be worthy of a gold star sleuther award!
I just measured the space between the backseat headrests. There are 19.5 inches between the two headrests, with the middle headrest down.
If the middle backseat headrest is up, then there about 4 inches between headrests.
This is a 2016 Honda CRV.
ETA: It is not difficult at all to move the middle backseat headrest up and down. You move it up manually with ease, and to lower it, there is a button on the side of the headrest that you press and it lowers very easily as well.