Bonuses are given per NFTs. For example, “Hold two different Body Types: 10% rewards”. So, if you hold one tall and one round Goomble, both of the NFTs will receive 10% additional rewards. Bonuses are given per set. If you hold 2 tall and 2 round, you are satisfying Criteria “Form Fusion” twice. Hence both 2 tall and 2 round NFTs will get a 10% bonus.