Hi,

I think you can do that by use option from: Customize > Footer Options > Add Google Adsense Code Above Footer.

Example use this HTML to display your images there:

\
<img src="http://soledad.pencidesign.com/soledad-business-magazine/wp-content/uploads/sites/70/2018/09/banner-header.jpg" alt="Banner">

Replace:

\
http://soledad.pencidesign.com/soledad-business-magazine/wp-content/uploads/sites/70/2018/09/banner-header.jpg

on the above code to your images url.

After that, add more this code to Customize > Custom CSS to do make this banner fullwidth:

\
.penci-google-adsense.penci-google-adsense-footer{ width: 100%; }\

Best Regards,

PenciDesign