Select Placement Settings.
Selecting Edit Placement in Adbuilder allows you to test multiple placements under one Ad Set. AdRules offers a tool to help you customize your assets to fit the requirements of each placement when you select specific placements under You can refer to those here.
Selecting the appropriate creative for each placement maximizes conversion rate and ROAS.
You can select to support only those placements that support asset customization.
Selecting Exclude Categories will allow you to block an ad from running next to certain types of content. Learn more about excluding categories here.