I'm looking to buy a 2014 Toyota Sienna, but not sure how I should configure my car seats. I have twin two year olds rear facing in Diono Radians and a 3 month old in a Chicco Keyfit. The baby will also move to a Radian when he grows out of the Keyfit. Should I put the twins in the third row with seat belt install and put the baby in the second row? Or would it be better to put the twins in the second row and the baby in the third row? Wondering from a fit, safety and pure ease of use.