panel can be configured to be on the buttom

defaults/main.yaml

@@ -16,3 +16,5 @@ application_starters:
   - firefox-esr
   - chromium
   - xfce4-terminal
+
+xfce_pannel_on_top: true

templates/xfce-customization/xfce4-panel.xml.j2

@@ -7,7 +7,7 @@
   <property name="panels" type="array">
     <value type="int" value="1"/>
     <property name="panel-1" type="empty">
-      <property name="position" type="string" value="p=6;x=0;y=0"/>
+      <property name="position" type="string" value="p={% if xfce_pannel_on_top %}6{% else %}12{% endif %};x=0;y=0"/>
       <property name="length" type="uint" value="100"/>
       <property name="position-locked" type="bool" value="true"/>
       <property name="size" type="uint" value="28"/>