The feet can print as-is with no raft or supports.
The splitter will need supports at the tips and under the mounting interface cavity. I have included a print file for the Prusa Mini that shows where these are.
You'll need to either:
a) Set the feeder on something roughly 35mm above the surface where the bowls are sitting
b) Print 4 of the foot design (which conveniently lift the feeder by 35mm) from this page and hot-glue them onto the 4 corners of your feeder
Then snap the splitter itself into the "accessory connector" (where the bowl that comes with the feeder is normally attached) and put two bowls in front of it.
I designed both of these parts with OnShape, and you are welcome to view and edit the CAD files.
The author hasn't provided the model origin yet.