It works back there.
I snagged 3 in the black friday sales last fall planning to put 2 back there and 1 in my husband's car. I frankly don't care for the seat. It is just too freaking wide and I don't like that it doesn't go backless.
My kids did have a little trouble buckling it but they were used to the graco in DH's car which is a smidge narrower, I think it is something they would have adjusted to.
Two of them in the 3rd row of the ody nearly touch each other. I don't know if you need to put anyone else back there. That seat is so narrow (the ody bench) that 3 across is difficult anyway but one of these in the mix would make it impossible. But if there are no other concerns, just looking at this seat + the ody bench, it worked fine as far as I remember. We have leather and the movement wasn't as big a deal as I thought it would be - but I still wish that had made the straps tightenable.
Another thing I didn't like about it is that while in theory not going backless doesn't matter, since it goes so tall - I felt like it was kind of squished in terms of shoulder room - so a taller/bigger kid would fit by height buy might not be comfortable. It's hard for me to say for sure since I have 6yo twins and my next in size test dummy is 10yo. (and by test dummy I mean my son, I don't actually have a crash test dummy here lol - I just use as many kids as I can to try out seats to get an idea of longevity)
At your daughter's age/size I think the backless for husband's car and parkway for yours is a good idea.