"Where does the UBI come from? It comes from the people working."
Not at all. The Land is characterized specifically by being NOT Labor.
The universal income comes specifically from the Land, fees on its exclusive use that benefit some lucky and sometimes also commited individuals.
And I'd say that we owe it to each other to better distribute it, for the benefit of everyone.
"There is not Land Value in a location that is simply used to store your body."
Depends on where it is stored... The Land Value of physical land is simply the price you'd have to pay to purchase an empty plot of Land in e.g. New York, it varies greatly by location, and it is not created by the work of the owner, but rather by demand for the Land.
Free advertisement and added value from the network effect, as well as cost savings due to Economies of Scale are both the Land, and they both deliver unearned returns to whoever happens to own undertakings that customers already know about or use, for a reason or another.
It's time to take the Land seriously. It doesn't just run away, it cannot hide under a rock, it's simply in plain sight, it can be found nearby what your average person wants/needs to use or enjoys. It really is a very simple concept. If you have plenty customers, you enjoy the Land and let it work for you for additional advantages that you did not create, that work against everyone else who'd seek to use the Land you use directly, or who seek to sell their labor the way you do. If your work isn't very popular, you might not be using a lot of Land in the economic sense, by the way.