I thought you all might be interested in some pics of the Diono angle adjuster in use. We have some available in NZ for retailers and techs for demo purposes (they aren't for general sale yet). These pics are in a 2009 Kia Carnival (same as a Kia Sedona) passenger middle row seatbelt install.
First pic you can see that the seat is starting to pull up when braced against the passenger seat in this position so obviously you wouldn't use it like this but it was quite hard to show the room it was generating.
The second photo was with the angle adjuster same positioning and we could comfortably fit a forearm between the seats. The seat wasn't installed tightly and no effort was made to increase the pressure to make the seat more upright. I am confident that we could have generated more room if this hadn't been done so quickly.
First pic you can see that the seat is starting to pull up when braced against the passenger seat in this position so obviously you wouldn't use it like this but it was quite hard to show the room it was generating.
The second photo was with the angle adjuster same positioning and we could comfortably fit a forearm between the seats. The seat wasn't installed tightly and no effort was made to increase the pressure to make the seat more upright. I am confident that we could have generated more room if this hadn't been done so quickly.