Thanks. I'm not sure what to do. Is the fit unacceptable? If not, are there any seats that install well in this position that are good for approximately 4-foot-tall kids (our younger ones, not pictured)? (Preferably narrow enough to allow the captain's chairs to slide?)
For the past few years we've had our oldest (pictured) in a Britax Frontier in a captain's chair (first in harness mode and then recently in booster mode), our middle child in a Frontier in harness mode, and our youngest (who is almost as tall as #2) in a Foonf front-facing in the middle seat. A great setup: the Foonf is narrow enough to allow the captain's chairs to slide forward and installs beautifully in the middle, so if we put the Frontier(s) in the third row we can conveniently carry 4 adults and 3 kids (when relatives are visiting, etc.). The trouble is our youngest is outgrowing the Foonf. I thought the Ollie was going to let us preserve these benefits, and I'm sure there was a thread here (with pictures, so somebody had actually tried it) saying that it worked in this position but I can't find it now.
So the plan was to have our oldest in the Ollie in the middle, and then the two younger in the outboard seats in the Frontiers. This lets us keep everybody in the second row (for cargo space and nobody likes to be in the wayback).
As our oldest is already too tall for a Frontier in harness mode I don't think there are a lot high-back boosters (besides the Frontier) that will fit her. And I'm not a fan of the way the Frontier installs in the middle seat anyway. The rigid LATCH on the Clek seats really helps here, and the Britax versa-tether is terrible in this narrow seat.
Ugh.
Edit: I found the thread:
https://www.car-seat.org/showthread.php?281876-Booster-for-center-of-Odyssey-with-Latch
It has a picture of the Olli installed and a statement that the fit is good, but no picture of a the kid in the seat that I thought I remembered.