With my three young'uns, I'll chime in with our experience.
We have used Graco units for all three to good performance...albeit no crashes thank goodness, the "performance" was from ease of getting them in and out. Not all Graco's are at the top of the recommended lists by default so you need to look around at all brands and ratings. Consumer Reports does a decent job at this and there are literally thousands of Parent sites on the web with their own versions. Graco has proven to be cost effective and worked well for us. Also mentioned here was Britax and they certainly carry a great performance record also.
Placement: My girls are 1, 2, and 6. The center of the rear seat, as already mentioned, is regarded as the safest. That's where daughter 1 went since she had a 4 year headstart as the only child in the family. #2 also got the center spot with #1 moving to the side. Now, with all three...we kept the youngest in the center while rear facing. Once she turned around, we have two large childseats occupying the outboard positions of the backseat because of sheer size. THe 6 year old now sits between them without being squeezed by either our Honda Accord or Pilot. The FJ seems plenty wide form what I have read.
So my 2 cents: If it were me, I'd mount to the center position of the rear seat for daily driving. It will be a hassle as you will have to get in the vehicle for mounting or dismounting. But you do get to more easily check on the baby and of course that safety thing. And something often overlooked, once forward facing, it's nicer to be able to share the view of looking out the front vs being stuck looking at the back of a seat in front of you...especially when the FJ has little side view from the backseat.
Other most prized possessions in the car for baby:
- I never went anywhere without a suction cup mirror to watch the backseat.
- Rear seat mounted toys can do wonders
- couple of extra pacifiers should be kept in vehicle if you intend to use these
- pack a backup diaper bag/kit with wipes, sippy cups, couple bottles of water, diapers, extra set of clothes, and snacks
- keep 2 towels in back: one to wipe baby's face before entering public (amazing what drool can do on a 5 minute ride especially if a snack is involved) and a second to lay out in rear cargo area to lay down baby for parking lot diaper changes (the absolute best part of having an SUV with kids!)
- Chewing gum...not for baby, for parents. Keeps you from wearing down your teeth when your gritting them form the screams of ready to be home
Congrats on the baby! I love every second with my daughters and it just gets better every day. Now if I can just get them hooked on offroading...oh yeah!