I set these two up in my home apiary, a little distance from the existing hives. One is a standard poly brood box. The other is a pair of poly supers with standard national brood frames inside. They have both top and bottom bee space, so are a bit tricky to use otherwise.
They were out for several months but got no interest that I’m aware of, perhaps due to being too close to other colonies though I’ve had swarms move in to empty boxes barely a couple of metres from active hives before now.