PILOTV Board Master Whiteboard Kit Markers Pens Magnetic Eraser Pen Holder,Black Blue Red Green Orange

Does this product, the pen holder, work sideways, so that the pens are held horizontal?

Does the eraser work well? Or does it smudge the board? And does it also work well when rubbing out writing that’s been left on the board for long?

Is the ink included ?

Why have Pilot designed a vertical pen holder when the instructions state that pens must be stored horizontally?