Where to define a global ion-tabs?

Considering that I will have 3 lower menu items ( tabs ), is it correct instead of creating files in the /src/pages/tabs/* structure to contain the items, do directly in src/app/app.html ?

Example (app.html):

<ion-nav [root]="rootPage"></ion-nav>

<ion-tabs>
  <ion-tab [root]="tab1Root" tabTitle="Tarefas a fazer" tabIcon="md-checkmark"></ion-tab>
  <ion-tab [root]="tab2Root" tabTitle="Todas as tarefas" tabIcon="list"></ion-tab>
  <ion-tab [root]="tab3Root" tabTitle="Configurações" tabIcon="settings"></ion-tab>
</ion-tabs>