Wiktionary
top tier
a. Belonging to the #Noun: elite, prestigious. alt. Belonging to the #Noun: elite, prestigious. n. 1 Top level, top rank, top standing. 2 elite.
Usage examples of "top tier".
Then her eyes dropped slightly to admire Orlith, ensconced right above the main hold door, and she thought how well Orlith's golden hide complimented the window hangings on the top tier.