Hi all, picking up on this thread. Ive been researching the "middle seat" and the only UK stocked option is the Diono Radian 5. According to their fitting guide https://us.diono.com/wp-content/uploads/sites/9/2017/11/Radian-5-Fit-Guide-EU_lowres.pdf, it does support use in the middle seat.
Keen to know if anyone else has used this on their RX's in this setup?