Hi,

1)If you need to make any customization above the login form, you can inherit the template login_layout and add the custom code in it.

eg:

<template id="new_login_layout_id" inherit_id="website.login_layout" name="New Template Name" priority="20">
<xpath expr="//div[hasclass('oe_website_login_container')" position="inside">
       // Add custom code
    </xpath>
</template>

2)

If you need to make any changes in the footer of the website , you can inherit the custom_layout and add your custom template

eg:

<template id="new_temp_id" name="New Template name" inherit_id="web.frontend_layout">
        <xpath expr="//footer" position="replace">

             // Add your custom code

        </xpath>

 </template

Hope it helps