I played around for about 1 hour with three across situations this morning
What did work:
Adult w/out seat but plenty of room, RN rfing or ffing, MT
MR rfing, RN rfing, MT rfing ( I had to really work to get this, but they did all install independently- I installed and took out multiple times to check)
I think RN, RN, MT would fit too but my other three RNs are in my moms car.
I also think RN and adult or narrow booster and MT would work too.
I've included a bunch or pictures for your viewing pleasure
This was fun!
Edit: And to clarify, I could not do MR, RN ffing, and MT. The MR and RN puzzle really well when both rfing though. And MR ffing, RN rfin and MT didn't work either. Plus, the RN rfing center is really reclined in this car - a lot more than when it is outboard.