i don't think there exist any "evolution of the universe" models that attempt to define or describe an environment into which the universe expended over time...if there are, i don't know how seriously regarded these models are in the scientific community. i may be wrong though, and such models may be out there...i'm just unaware of them if they do exist.
also, i don't think there is such a thing as a "dimensionless void." by definition, a void is an empty space, or a space completely absent of matter and/or energy. the only dimensionless entity in our universe would be a point. and i think the simplest definition of a void would be an empty space between two points. in this case, the simplest "void" would be the absence of a line (or infinite set of points) between two endpoints. in 2 dimensions, a void would a surface (another infinite set of points) absent of any matter/energy, contained by 2 or more lines (you might be thinking that it takes at least 3 lines to constitute a "closed" area, but think outside of Euclidean geometry, i.e. think curved surfaces). in 3 dimensions, a void would be a volume absent of any matter/energy, contained by 2 or more surfaces. what I'm getting at here is that a void implies dimensions, and is not dimensionless.
finally, it would be impossible to tell if the uncertainty principle applies in such a void if it existed b/c a void is by definition empty of matter/energy. there would be no particles' positions or measure, and no particles' momentums to be uncertain about, or vice versa.