Defining multiple Data Adapters and sending all their data to a single client page is not possible at the moment, though it will become possible with the next release of the software.
However, you can connect to all your external processes from a single Data Adapter and assign to each flow a different item name. Your client would be able to ask for all data by specifying all the item names, in a way similar to the StockList demo example provided in Lightstreamer package.