Welcome
I can't help with that particular seat as never had a spinning rear-facing one in my bug, but I have used isofix in it for the little'un (well, she's nearly 6 now...) over the years.
My only observation is that there's slightly less room on our forward facing child seat between that and the passenger seat back, when compared to our other two cars. I'm sure it would technically fit, but depends how far forward you need to slide the passenger seat / tweak the tilt a bit more vertical, just to allow it to spin.
This is the setup i did use in the bug when she was a baby, and it fitted fine.
https://www.pramcentre.co.uk/car-sea...ing-grey-p5225