All 96Boards? No.
For a start IoT Edition boards don’t have these pins connected at all (they are 5v only) and for Enterprise edition boards accepting power on the 12v rail is optional (and may even not be recommended).
However all the Consumer Edition support being powered by the LS connector. 10V at 2A is only 20W though… I’d prefer 12V but I think that’s probably OK. A 24W power supply is commonly used with 96Boards and some of the power budget is to power the mezzanine… in your use case all of the 20W is for the base board!