I confirm that multiple Engines in the same pages are not supported
and multiple Engines in different pages are not recommended (we recommend that you share the Engine among all your pages).

Stopping and restarting push on single tables can be done by calling removeTable and then addTable again, leaving the same table id.
The screen appearance of the tables is not changed;
moreover you have the option to either leave or clear the current values on the table during this operation (see the setClear... methods in the VisualTable superclass).
If you don't clear the values in the table, ensure that the snapshot is requested upon subscription.