Right from day one, make clear rules and post them, with logical consequences and with rewards. Move your ADD ADHD student's desk to where there are fewer distractions. Close to the teacher to monitor and encourage, or near a well-focused child. Privacy boards can work well, but should never embarrass a child.
Open pods allow too many visual and auditory distracters throughout the day.
It is usually better to use rows for seating arrangement and to try to avoid tables with groups of students. Often the groups are too distracting for the ADHD child. In the ideal setting, provide tables for specific group projects, and traditional rows for independent work. Of course, we are rarely in an ideal setting. Every once in a while, try arranging desks in a horseshoe shape to allow for appropriate discussion while permitting independent work.