The Founders exist on a level where it is difficult to differentiate between what you would recognize NOW as THEM
and yourselves, and the Anunnaki and every other species. The Founders are foundational on a level wherein all beings that you know of, or have heard of, are in some senses an aspect of the Founders.

Q: In the Higher dimensions?

B: Yes. And the Founders are the direct precursors of the Lyran seed. But
they were not as you understand it physiologically in your dimensionality. They
did however project a portion of themselves into physical dimensionality and
took on the humaniform aspect for the purpose of that experience.

Q: What time frame?

B: Millions, upon millions, upon millions, upon millions of your years ago.
Many, many, many, many, perhaps as much as you would recognize, even perhaps
half a billion of your years ago, perhaps even more so.
- Bashar