How to initialize object in room with specified positions?

Hello HoloMasters,

How can I achieve something like in this video:

https://youtube.com/watch?v=QrEIIqs2o2E

My Questions:

1. How to generate a big plane wall like in the video? Does the wall actually hold the objects (couch, refrigerator, etc)?

2. Which features of SpatialUnderstanding.cs should I use to find big wall and generate the plane base on it?

3. Is there any easier way to specify object placement. For example, I want to place table right in space between wall and floor (90 degrees). I still confused which approach should I use because right now all 3 major features in SpatialUnderstanding.cs is really confusing. I have tried to use Object Placement features but can't find the place that I wanted.

Thanks in advance for those for can help me.