Hi just wondering on the offchance if anyone has a Renault Zoe and uses a high back booster for a child between 130 and 140 cm? We test drove one today and had a problem that the "wings" of the headrest of our Britax kidfix couldn't extend high enough for our 7 year old as the curve of the roof got in the way. We could obviously use a backless booster but we'd rather not.