Hello Paul,
Yes, you can add slider as widget to some section you do not use. For example if you do not use Newsletter Section you can go to Appearance>Customize>Widgets>Newsletter Section and add MotoPress Slider Widget and select one you need from the list. In order to put it to the top of the page you should go to Appearance>Customize>Newsletter Form section and set Section Position to 0 or 1.
Best regards,
John Smith
MotoPress Team