To impose jobs per the layout above, set FFCore to impose using 2 Rows and 2 Columns and then use the Row transform Mode (see icon on the top, right corner of the layout) to rotate the bottom row of the layout
Then open the preview to show the front and back of the press sheet and use the Manual Page Order to define which document pages to put into each of the page cells.
FFCore will use the above page order as a pattern until all pages in the document have been imposed.