netbox/netbox/templates/dcim/rack_list.html

{% extends 'generic/object_list.html' %}
{% load helpers %}
{% load static %}

{% block extra_controls %}
  <a href="{% url 'dcim:rack_elevation_list' %}{% querystring request %}" class="btn btn-sm btn-primary">
    <i class="mdi mdi-view-day-outline"></i> View Elevations
  </a>
{% endblock %}