Redacto loads first in <head>, then Google Publisher Tag and a Prebid build with the TCF and GPP consent modules. The panel below shows what the ad stack reads from the page: the two IAB APIs, the regime Redacto resolved, and what each slot rendered.
Prebid + GPT, 300x250 (/19968336/header-bid-tag-0)
GPT only, 728x90 (/6355419/Travel/Europe)
Your ad unit, 300x250
Waiting for the page to settle...