I got a triple stacked 'arrangement' through last winter. These were swibines, gaffa taped together with bubblewrap over all three - a piece of polystyrene was taped over the top two entrances/mesh panels as they would otherwise have lost too much heat. By spring, once I had prized it all apart, there were enough bees to fill one mini-nuc. The swibines have a plastic ventillated floor - different to the solid Apideas. I fed them until quite late in the year, I recall - provided the weather was OK for the bees to fly, they could cope with the syrup going in. (They do seem to use a fair amount of food and starvation is a concern with small hives like these.
This year I have two of the swibines left, but they are now queenless and as soon as the remaining bees emerge, they will be shaken out in front of other small colonies to strengthen them. (This will be my first winter with some Abelo mini plus boxes, two of which could benefit from a cupful of bees each).
May your bees read the same books as you do.