Two toolbars in a row

Yes, you can.

'This code adds the toolbars,
  Dim ToolBar As CommandBar
  
  Set ToolBar = CommandBars.Add("Standard", xtpBarTop)
  With ToolBar.Controls
    ............. 
  End With
  
  Dim ExtendedBar As CommandBar
  Set ExtendedBar = CommandBars.Add("Extended", xtpBarTop)
  With ExtendedBar.Controls
       ...........  ;   
  End With
   
'This code docks a toolbar to the right of another toolbar
  DockRightOf ExtendedBar, ToolBar, False

'This is the code for the DockRightOf function
Private Sub DockRightOf(BarToDock As CommandBar, BarOnLeft As CommandBar, Optional VerticalBar As Boolean = False)
  Dim Left As Long
  Dim Top As Long
  Dim Right As Long
  Dim Bottom As Long
  
  CommandBars.RecalcLayout
  BarOnLeft.GetWindowRect Left, Top, Right, Bottom
  
  If (Not VerticalBar) Then
    CommandBars.DockToolBar BarToDock, Right, (Bottom + Top) / 2, BarOnLeft.Position
  Else
    CommandBars.DockToolBar BarToDock, (Left + Right) / 2, Bottom, BarOnLeft.Position
  End If
End Sub