Create an mbox with at.js 2.x

Hi Team,

mboxCreate method doesn't work with at.j.
How could we create an mbox div at page level?

I tried with below code but no luck :

<div class="mboxDefault">
adobe.target.getOffer({
"mbox": "customTestMbox",
"params": {
"status": "true"
},
"success": function(offer) {
adobe.target.applyOffer( {
"mbox": "customTestMbox",
"offer": offer
} );
},
"error": function(status, error) {
console.log('Error', status, error);
}
});
</div>