Usage patterns
〈人〉が上位に入るfor someone (or something) to rank among the top
He placed among the top ranks at the national tournament.
〈人〉が上位を占めるfor people or things to occupy the top positions
Japanese products occupy the top rankings.
上位〈数〉位以内within the top N ranks
We aim to place within the top 10.
〈物〉が上位に位置するto rank or be positioned near the top
This university ranks near the top of the world rankings.