... is called the Place (or Space) of all that exists, because this is what gives them the ability to exist, which the aspect of limitlessness did not give them. It is called a “place” or “space” inasmuch as it fulfills the function of a place or space, which contains that which stands within it. However, it is not a place in the physical sense of being an actual place containing whatever stands within it. For the concept of physical space is not applicable to the Sefirot, since they are Godliness, and Godliness has no physical dimensions.
The Kabbalistic Idea of a Place for All Existence
Kalach Pitchei Chokhmah 26:23