A parallel concordance from the 1996 European Parliamentary Debates gives us two equivalents for περίοπτη θέση:

σε περίοπτη θέση βρίσκουμε έναν πίνακα it does contain a prominent table
έναν τομέα ο οποίος κατέχει από μακρού μία περίοπτη θέση a sector which has a long-term and established position

Notice in the second example the variation at a grammatical level between the two languages.

Useful collocations with prominence, prominent, and prominently include

give prominence to, feature prominently, occupy a prominent position (both literally, e.g. on the front page, and metaphorically, e.g. important position in a political party).