Thanks for the reply. Maybe just as well I don't have french doors! I think the ranges I'm looking at for sliders Futura+ and PureView won't have the issue of the badly placed lock.
And yes, main reason I wasn't too keen on Rationel was the sliding doors were way too chunky. I would switch to Velfac sliders with Rationel windows, but I also really don't like the look and feel of the Velfac handles! Gosh, I know I'm picky, but I am an interior designer, it's my job! 😅