The requirement you are finding for login/login may be due to a custom theme.? I believe by default XenForo's login is always an overlay which would not display ads.
I thought this would be good place to re-post the full list of XenForo 2 templates that you should prevent Adsense ads from showing on to keep in compliance with their rules:
Code:
account_alerts
account_avatar
account_bookmarks
account_connected
account_connected_associate
account_details
account_email
account_following
account_ignored
account_preferences
account_privacy
account_reactions
account_security
account_signature
approval_queue
contact_form
conversation_add
conversation_edit
conversation_invite
conversation_leave
conversation_list
conversation_reply
conversation_view
error
find_threads_list
forum_post_thread
help_index
help_page
login
login_password_confirm
login_two_step
lost_password
lost_password_confirm
message_page
news_feed
register_complete
register_confirm
register_connected_account
register_form
report_list
watched_forums_list
watched_threads_list
If you have Media Gallery add:
Code:
xfmg_category_add
xfmg_media_edit_image
xfmg_watched_albums
xfmg_watched_categories
xfmg_watched_media
If you have Resource Manager add:
Code:
xfrm_category_add_resource
xfrm_resource_edit
xfrm_watched_categories
xfrm_watched_resources