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No, unfortunately, it does not stack if you put multiple Monkey-Drum-Villages in the same area, I have tested and re-tested this in game multiple times, for example, one of the times I tested it with 20 of them, and they were all centered around a single 0/0 dart monkey, and the effect was only that of one-fold the advertised amount, as otherwise, it would ...
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You can find the save file for Bloons TD 5 Deluxe (now known as Bloons TD 5 Steam) at the following location:
C:\Program Files (x86)\Steam\userdata\(your steam ID)\306020\local\data\docs.
OldProfile.save and Profile.save is your save file.
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