I am so LOST!

Im kinda lost and need help! I have a 2007 tahoe with three seats in the middle row and two in the third row. I need to fit five carseats. Orignally i wanted two rfing ones in the third row because it seems like it would be easier to buckle the kids but i cant fit anything there. So far i have tried a graco my ride and a blvd 70. Since the blvd 70 wont fit i would assume im out of luck for rfing seat in the back. I will have to put the two evenflo chases back there with 2.8 yr old twins. For the middle row i have my dd in a blvd 70 rfing outboard passanger. Would like to leave her there if possible since shes with my all the time. I need two more seats for the middle row and would like them to be rfing also. So far i have tried the myride 65 and i just cant get a tight instal with seatbelt or latch so thats out. I have a radian xtsl in my dd dads truck that i could use in the center rfing if it would fit next to the blvd nicely which i dont see a problem with that but who knows. If it comes down to it i could put a foward facing seat in the middle row but would just perfer them to be rfing. I am thinking of ordering two britax roundabout 55's to use but then agian i dont know if i can fit three rfing in a row or if they would puzzle well rfing ffing rfing. I know i have rambled ALOT but my mind is all over the place.

To sum things up:

Third row Chase 2.8 yr old Chace 2.8 yr old
Middle row RFing blvd 12 mo. ?roundabout or radian? ?Rfing roundabout?
20 mo or 24 mo 20 mo or 24 mo

Im leaning towards the britax because i know i can install it well with latch and seatbelt as the outboard diverside middle row does not have latch.

Please let me know of any other options i am missing i need this figured out soon as i would like to take the kids somewhere on thursday!

If you would go with the roundabout what color would you choose gumdrop or smokey pearl? These are for daycare kids so i would like gender netural. My dd blvd is the sophia pattern and her xtsl is the pink flowers (cant think of it name) but i would like the seats to look somewhat ok together?

THANKS for any help i know i have alot of stuff going on here but thats why im here asking for help!

I would go with the gumdrop pattern in the roundabout. I think they would all 3 fit RF. I have an 08 suburban with 3 seats in middle row & two in 3rd row, so basically same vehicle except I have extra cargo space. If you go to britax's website. It should have the dimensions of the seats so you could measure & see.