How to attach Backbone.Marionette view to existing element without creating extra element

How to attach Backbone.Marionette view to existing element without
creating extra element

Say I have these two Backbone.Marionette views:
var FooView = Backbone.Marionette.ItemView.extend({
tagName: p,
id: 'foo',
template: this.templates.summary
});
var BarView = Backbone.Marionette.ItemView.extend({
template: this.templates.summary
});
And then I want to show them inside an app region, like so:
App.contentRegion.show(new FooView/BarView());
The first view would create a new
element and append it to the region. I thought the second way would be
more like a standard Backbone view and attach itself to the region without
creating a new element, but it wraps it in a tag. Is there a way to avoid
this without using something like setElement()?