What page the ad will be located on in the publication are all decisions involving the PR and the Editorial boards.
Step-by-step explanation:
The positioning of advertisements on a publication is something that is usually pre decided by the firm for the spots according to the preferences they give to certain clients during an ad cycle and in special cases, they make amends to these policies.
These policies are drawn up by the PR team in accordance with the Editorial team to make sure to have proper and required space to run ads to the maximum profit of all the beneficiaries and to give attractive spots to lure more cosponsors.