D'Souza made a movie of this, but you can see a rather interesting map on this post from Sundance.
True the Vote, a vote-fraud detection outfit that's been in business for quite some time (long before the '20 fraud) purchased publicly-available geo-location data and overlaid maps of "drop boxes" in several States. D'Souza built on their work.
If the 'dots' in Wisconsin are accurate, there was activity in Milwaukee and Dane Counties--which you would expect--but also Up North. This is a smart, subtle move on the part of whoever wanted to control the results of the '20 election. Rather than concentrating all the "mules" in 2 counties, spread them around. All they needed was 20K votes, so 2,000 in 70 counties plus 6,000 in Mke/Dane and.....badabing, badabang, badaboom! Election won!