"Unique" is already a superlative. One thing cannot be "more unique", let along "most unique", because these are comparative, and "unique" is a quality that specifically denies comparison.

Words mean things. PLEASE hire actual writers, and give them actual editors.

Celebrimbor forged 16 rings of power, with Sauron's assistance. It isn't stated why precisely this many. They were not made for other races, although Celebrimbor did give one to Durin VI of Khazad-Dum, close ally of the elves of Eregion. These were the rings that would become the Seven and the Nine.

Then Celebrimbor, secretly and alone, made the Three. Sauron never touched them, and never knew with certainty where they were bestowed.

Sauron made the One Ring, the Three were hidden, the Seven and the Nine captured, and became tools of policy for Sauron afterwards. When Sauron captured the ring of Thror from his son Thrain II late in the Third Age, it was the probably the first time he had seen it since he assisted in its making. It was the last of the rings of power to fall into his hands.

The notion that the Seven were made for the dwarves, and the Nine for men, is a misunderstanding from a casual reading of the famous verse not ed in the text. The story the show is telling is a bad fanfic.

That's why Tolkien fans aren't watching. Not dark-skinned persons (ed in the text), not prominent women (a Tolkien staple - they are few but of consequence), but a fundamental failure to comprehend Tolkien's work.