Meta offers an opt-in placement setting called Multi-Advertiser that allows your ad to appear alongside other advertisers' ads within the same ad unit. While this can increase ad delivery volume, it introduces quality and control tradeoffs that generally make it worth disabling for most campaigns.
When Multi-Advertiser placements are enabled, Meta may:
The setting is found at the ad set level within Meta Ads Manager.
The core problem is loss of creative control and contextual relevance:
"They might be cropping our ad in half. They might be putting it next to an ad that doesn't necessarily make sense."
— Sebastian Gant, Adava Care Marketing Call, October 2025
This should be part of any standard campaign QA checklist when launching or auditing Meta campaigns.
Multi-Advertiser placements are distinct from but conceptually related to Advantage+ Placements (formerly Automatic Placements). Both represent Meta's mechanisms for expanding where your ads appear beyond your explicit selections — trading placement quality for delivery scale. See [1] for guidance on that setting.
Meta enables this setting by default in some campaign configurations. It should be explicitly checked and disabled during campaign setup and when auditing existing campaigns, as it may have been silently enabled on inherited or duplicated ad sets.