UBO means Ultimate Beneficial Owner, so yes, that's implied. 😉
The risk with nominee structures is if someone takes a hostile view at the setup. I see structures like this go by unquestioned and unnoticed for years. As long as you pay taxes due on the dividends you receive, the risks appear low that the company itself is put into question. But if︀ someone were to start poking around, an argument could be made that the nominee directors︁ are just acting on your instructions and you have effective control over the company. At︂ that point, you either accept their ruling and take them to court (and maybe win?).︃