How to avoid extra wrapping in React?

This requirement was removed in React version (16.0)]1, so now you are able to avoid that wrapper.

You can use React.Fragment to render a list of elements without creating a parent node, official example:

render() {
  return (
    <React.Fragment>
      <ChildA />
      <ChildB />
      <ChildC />
    </React.Fragment>
  );
}

More here: Fragments