select from sovrn's integrated demand bidder list. The mvp will have the 'top ten' with more to follow in ongoing updates
map all ad served ad units to sovrn tag id's to include in the wrapper code
'Server to Server' sometimes also called 'Server Side Bidding', or abbreviated as 's2s' refers to a solution where the header auction occurs on a hosted server and not on the publisher's web page (aka "client-side"). Sovrn is currently testing it's own server to server solution with select beta publishers. More info will be made available as we approach a release date.
For more info on Server Side Bidding check out these other articles!