Portable Shop - Use with Surface or Creator's Waffle Grids

I bought the portable glass kit and was short 3 items. what should I do

Is the waffling grid made from the same eggcrate grid you can find at your local hardware store?

I just got mine. It says it is not compatible with the other waffle grid--although the title clearly says it is compatible. Which is it?

Will this system work with just one morton mini surface plus pack (so two boards) or do you need two packs (4 boards)?