I am planning a kitchen at the moment too and have been looking at the Neff slide and hide. They get such great reviews.
I was going to go for two full size single ovens and then put a microwave in the larder cupboard as we don’t use ours loads. I want to be able to cook a full roast dinner with the roast, potatoes, cauliflower cheese, Yorkshire puddings, pigs in blankets etc! And I’m not sure a single oven and combi oven would have enough shelves to do all that?