You can't apply the question, "what location" to when no space existed,
It is believed that photons, and some sub-atomic particles (not being 3 dimensional) do not occupy space ( so it is believed) But the way I see it, every thing needs a location, being inside the universe and part of it. But getting back to my OP question, since the universe is believed to begin with the big bang, what caused it to become the big bang since something physical expanded becoming the universe, requiring location outside it to contain it, and energy to fuel its expansion. Where does the expanding universe exist now, space being part of it? Does space need some location to exist?