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Normally if you place three the same size icons in a stack, they will stands on top of each other, then we can use 'Align' and 'Position' to positioning them:

class MyApp extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
   return MaterialApp(
     home: Scaffold(
       body: SizedBox.expand(
         child: Stack(
           children: <Widget>[
             Icon(
               Icons.camera,
               size: 100,
               color: Colors.red,
             ),
             Align(
                 alignment: Alignment.center,
                 child: Icon(
                   Icons.camera,
                   size: 100,
                   color: Colors.blue,
                 )),
             Positioned(
                 bottom: 20,
                 child: Icon(
                   Icons.camera,
                   size: 100,
                   color: Colors.green,
                 ))
           ],
         ),
       ),
     ),
   );
 }
}