There is no special tier for Maker of Monsters or Mistress of Maps. If you look on the main campaign page, you will see the second graphic is a pledge calculator. Click on that, then use it to determine how much you would like to pledge (including the Maker of Monsters and Mistress of Maps items). Then adjust your pledge to that amount.
A few weeks after the campaign ends, you will receive a survey from Backerkit asking what items your money was pledged towards. You will select the Maker of Monsters or Mistress of Maps Vaults there, as well as any other Vaults that you would like.