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Multiple finality counters on a single permanent are redundant.

The creature spell you cast will be a Vampire in addition to its other types while on the stack. The resulting creature will be a Vampire in addition to its other types.

Finality counters aren't keyword counters, and a finality counter doesn't give any abilities to the permanent it's on. If that permanent loses its abilities and then would go to a graveyard, it will still be exiled instead.

If you somehow activate The Tome of Aclazotz's ability more than once during a turn, you can cast a creature spell for each ability's permission. Similarly, if another effect allows you to cast a creature spell from your graveyard, you may use that permission and later use The Tomb of Aclazotz's ability to cast another creature spell.

You must still follow any timing restrictions and permissions for creature spells you cast with the permission granted by The Tomb of Aclazotz's last ability. Normally, you'll be able to cast them only during your main phase while the stack is empty.

Finality counters work on any permanent, not only creatures. If a permanent with a finality counter on it would be put into a graveyard from the battlefield, exile it instead.