3 x Multi Poster (A3 Size)

I am looking to create 3 x A3 posters which feature multiple album art / movie posters on one page.

Poster 1: 4 x Ed Sheeran Album Art Covers on 1 A3 Print (Portrait Ideally)
Poster 2: 4 x James Arthur Album Art Covers on 1 A3 Print (Portrait Ideally)
Poster 3: 6 x Jurassic Park Movie Posters (1-6) on 1 A3 Print (Landscape)

I have attached a previous example of a poster I had made by another freelancer. Each poster will need to be saved as a PDF and JPEG. I will provide the images upon request. I would like all images to have a white boarder that is equal in size all the way around and all images MUST be level / the same size. I will be printing these so margins and central images are key.

Any questions please feel free to ask.