Why considering universe as infinite makes question about placement and what is outside not important? As it really doesn't matter if space is finite or infinite for this question as we really can't see beyond it, it makes this question more of a philosophical nature.

And even if space is finite and has boundaries, for me there is no "what is beyond the edge" question and not even because we can't reach it (as few people already mentioned). Why? Because beyond edge nothing exists. Absolute nothingness, no black or white space, just nothing. No time, no space, as those exist within edge. Universe is not placed anywhere, as it defines space and placement itself.

But probably it still doesn't have any boundaries anyway but if it is infinite or finite...

Well, what was the starting mass of space? ;)