Add container class around rows

Hello!

I want to get such html structure

<div class="">
	<div class="container">
		<div class="row">
		...
		</div>
	</div>
</div>
<div class="">
	<div class="container">
		<div class="row">
		...
		</div>
	</div>
</div>
...

I want to use Panels Bootstrap Layouts for this, but I cannot do that, because Panels Bootstrap Layouts module does not allow to wrap separate rows into containers.
So I am forced to use mini panels to get what I want.

My feature request: add option to wrap rows with DIV with "container" class. (in layout designer)

Is it possible?

EDIT: Or maybe it is better to add ability to add multiple canvas to layout designer?