view/frontend/layout/default.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright 2016-2018 Henrik Hedelund
 * Copyright 2020      Falco Nogatz
 *
 * This file is part of Chessio_Matomo.
 *
 * Chessio_Matomo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Chessio_Matomo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Chessio_Matomo.  If not, see <http://www.gnu.org/licenses/>.
 */
-->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceContainer name="after.body.start">
            <block class="Chessio\Matomo\Block\Matomo"
                   name="matomo.tracker"
                   as="matomo.tracker"
                   template="matomo.phtml" />
        </referenceContainer>
        <referenceBlock name="head.additional">
            <block class="Chessio\Matomo\Block\Matomo"
                   name="matomo.tag_manager"
                   as="matomo.tag_manager"
                   template="tag_manager.phtml" />
        </referenceBlock>
    </body>
</page>