We had a proper damp surveyor for this place (we pulled out the kitchen, and groo) and that was down to cold walls, moisture, limited airflow around the back of appliances, and the fact the dishwasher had been leaking slowly like an old, drunk uncle into the corner for years. Once we'd cleaned up after the incontinent dishwasher (or rather paid someone to do it), he recommended tiling the walls behind the units (so moisture can't soak in), making sure there was space for airflow, and keeping the kitchen warm.
Basically, any significant temperature gradient will condense ambient moisture, but mould requires permanent moisture ~75% or higher – so a surface that is wet more than it is dry.