How can we achieve multiple forms in a single page?
You can do it!
With the drupal fapi. You can overload every HTML attributes by using the element #attributes.
Exemple:

  $form['form_element'] = array(
    '#type' => 'textfield',
    '#title' => t('If you Have a Code, Redeem it here:'),
    '#attributes' => array(
      'id' => 'your_id',
    ),
  );

If you add a counter or something to your id, you will have a different id for each fields.
Cheers