After the interview, I introduced the prototype and asked participants how they would feel if it lived inside their home. Specifically, their bathroom or bedroom.
I then prompted them to move the box around the space, and consider what it would mean for them to live alongside it. I observed an array of ideas, feelings, and reactions about the product, their ideal interaction with it, and what they would need in order to make it work for them.
In general, the thought of having the box in their home provoked an immediate rebuttal, followed by a soft concession, considering its medical necessity. If they had to have it, then they would make it work. This lead to some creative thoughts on compromise. (Perhaps you could turn it on its side? Mount it to the wall? I mean it sounds crazy: but what if it hung from the ceiling?)