Oh, I'm so sorry, I must have missed your response before
abejita!
I personally have not installed the
Radian or any 3 across configuration in a Subaru (at least not correctly

I had 3 kids improperly restrained in my old Legacy before I became a tech, but by then I had my Escape instead)
I have successfuly fit various 3 across combinations in the Accord & Camry since my certification, though

Not with the
Radian, but specifically with
Britax,
Graco & Dorel Juvenile: any up-to-date CPST should be able to help you with making sure you've got them in + used correctly
