It all depends on what you prefer. HPL(formica) is mostly smooth and slippery, there are some textures that are less slick.You can use melamine panel, which is medium density fiberboard(MDF)with a resin finish, then you need only seal the edge. This is what most manufacturers use, and is quite heavy, and dampens vibrations nicely. You can bolt directly to the counter top, and not be concerned with the base not being large enough, and falling off of it. Any home builder supply can provide you with pre-made counter top of whatever length you want, as well as the MDF, which can be purchased as a full sheet or partial(some will even cut it for you).

Rick