Synonyms for "multiple things that reside in the same location" - I can think of "colocated," which I've only seen in an engineering context. Do any other words fit the bill?
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try juxtaposed from juxtapose
or even cohabit
How about co-ubietous?
Outside of narrow, technical and philosophical contexts, ubiety means "the state of being located somewhere particular," which seems just the right start for what you're seeking.
I think this might be too vague for what you're looking for.