Dang. I hoped it would be easy. The only thing I can think of is the min height setting? Can you drag them down and position manually? The video, it looks like it is positioning them above the house instead of inside. I've done the inside on another video I made so I know it works, it was an older unity though. I like to set the height setting as low as possible them position each one for precision. Beyond that, I am using pegasus in a video now I'm making and not having that particular issue, but this one is in a forest. Using 2019.4. Hope you get it figured out and let us all know, so we can know the solution if we run into that as well.