This is how you should define k-editable
:
<div kendo-grid k-data-source="products" k-selectable="'row'" k-sortable="true" k-toolbar ='["create"]'
k-columns='[
{ "field": "Nome", "title": "Nome"},
{ "field": "Cognome", "title": "Cognome"},
{ "field": "Cellulare", "title": "Cellulare" },
{ command: ["edit", "destroy"], title: "", width: "172px" }
]' k-editable='{"mode": "inline", "create": true, "update": false, "destroy": true}' style="height: 365px">
</div>