This mod raises the Limit of the max possible number of Productions placeable in a savegame. Default this number is set to a maximum of 60 Productions. With the help of this mod this Limit is raised to 120.
Note that the Limit isn't set without reason so increasing it and placing more Productions than intended might come with some performance drawbacks especially if all of those productions are actively producing stuff.
How many placeables are possible without negative effects are dependend on other factors within each savegame so you have to see for yourself.