I have that board. I love it. ... Yes, I know, we can build one cheaper. But,...

About the magnets, yes, too few. Order 100 from the website link that Carrell posted. Just place it on a flat surface. The magnetic board is very flexible and will shape to any non-flat surface curves resulting in a bad building.

I use it over a GP wood board of the same size and those on top of a 1" flat top table where I work. Can't be more flat than that. Overkill I know.

Ask for help if you're in doubt how to use it.

Pedro