Update Linkedin background (masthead) picture with existing logos

We are looking to update a masthead picture for our personal and company's Linkedin pages (two mastheads). We already have the page with one specific logo, our own. We will now wish to add several other existing logos, to be captured from certain websites, to the same masthead in a tasteful arrangement. -- We believe this to be a quite s i m p l e job of adding logos to a background, but it must be done with taste and high quality, adhering to specific Linkedin masthead format requirements. Please expect that there will be 2 x 3 different versions of the output file, where certain logos are included or excluded, so the output is not just a single file but 6 files. Example of current with just one logo, in attachment.