Question

An advertiser using viewable cost–per–thousand impressions (vcpm) bidding wants to maximize exposure on a specific set of sites selected for a new campaign. which is a best practice when setting up the campaign? set bids on individual placements

Answer 1

Setting bids on individual placements would be the best practice while setting up the campaign.   In this way you can increase or decrease user traffic on your placements by simply adjusting your bid on a particular site.   Individual bids can be increased in just one website in order to increase the desired user traffic.