Background

Xandr SSP supports "Roadblocking", where a Network (so same buyer and seller from a seat perspective, although not domain) can coordinate multiple ads across a page for more impact (think seeing the entire page covered with Coors ads for the Super Bowl).

The publisher can enable roadblocking on their inventory, and then the ad manager enables roadblock buying per line item, and can set various settings about number of ads, master creative, etc. The roadblock ads compete against other ads as a unit, are frequency capped as a unit, budgeted and paced as a unit, reported on as a unit, etc.

Problem

With no multi-tag auction ability, this feature will go away.

Solution Seed

Same as the seed discussed in #773 , having the ability to coordinate bids and then score across them, would enable this.