Hi,

To print the header/footer only on the first/last page, you can use the OCA module.

* https://odoo-community.org/shop/report-qweb-element-page-visibility-2192

After installing the module, use the first-page or last-page class.

Header

<div class="header">

    <div class="first-page">

        <div class="row">

            <img t-if="company.custom_report_header"

                 t-att-src="image_data_uri(company.custom_report_header)"

                 alt="Logo" width="100%"/>

        </div>

    </div>

</div>

Footer.

<div class="footer o_standard_footer">

    <div class="last-page">

        <div style="width: 100%;">

             <img t-if="company.custom_report_footer"

             t-att-src="image_data_uri(company.custom_report_footer)"

             alt="Logo" width="100%"/>

          </div>

      </div

</div>

Hope it helps