Yeah, it's a tricky one as people shouldn't be able to reserve spaces outside their house on a public road, but they're only wanting to do that because there aren't any facilities to lock a cargo bike to. I think a series of simple metal hoops installed on the pavement (sidewalk?) next to the road would provide a decent solution and would also prevent drivers parking cars on the pavements which is very common with our narrow roads. It's in our interest to make it easier and more convenient to get people to replace car journeys with bike journeys and cargo bikes fill a very useful niche for transporting kids and other stuff around.