How R6 placement boosting works
At the start of each season R6 Siege soft-resets your rank and asks you to play a short run of placement matches before your rank is set. Placement boosting hands those matches to a Champion-level booster, who plays them for the strongest possible starting rank. It is a fixed job — the placement games and nothing more — so it finishes when they are done rather than running toward a target tier. Because these games grant boosted RP, the rank you settle on afterward is the platform every later win builds from, which is why a clean placement run is worth more than the same wins scattered across a full season.