2004 VW Passat Station Wagon
Britax Marathon FF behind driver (seat belt install)
Graco Snugride in middle (seat belt install)

We wanted to have a backseat free for a passenger, and it worked!

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2005 Toyota Prius
Grago Snugride behind passenger (seat belt install)
Britax Decathalon FF middle (seat belt install)

Did NOT work. We were hoping to have a backseat free for a passenger, but we couldn't get the snugride to snap in with that setup. Ended up having to leave the middle seat empty, and it's too narrow for anyone larger than a preteen to sit in.