The correct term is anchored, rather than embedded, image.
Where would you like this image to move? There is an option for custom positioned anchored images to keep within top/bottom column boundaries, but it might not help you out. Most likely that would cause the image to cover your subhead and possibly text from the previous section as well.
I figured out a workaround that takes care of this most of the time. I set thet the keep options for the body copy to keep the first 5 lines together, which almost always moves the image onto the next page.
If any Adobe devs are reading this, a "Keep embedded images on page" option would be nice. Maybe it should be the default.
Again, I'm going to ask what behavior you expect for this? Where would you have that image move? If what you want is for the entire paragraph to go to the next page, you are using the correct mothod by adding a keep option that will keep sufficient lines together to match the image height. Adding the keep within the top and bottom boundaries of the column (rather than the page) for inline anchored images might be useful if it behaved like a keep option forcing the containing paragraph to the next page, but not so good if it pushed the position of the image up or down relative to its anchor point.
What you are learning is that anchored objects are extremely useful, but that they are problematic when they fall at the bottom of a column. You almost always need to som manual editing to accomodate the odd case.