Upload images for non-users

Hi everbody,

I would like to create a website where it is possible for non-users to fill in a small contactform (e.g. name and birthday) and uploading images. These images should be categorized and the amount of images per category are limited (e.g. only 10 images per category are allowed).
So, each form request has to include contact information and as well some images.
In the wordpress-backend (as a logged in user) I would like to see the contact data with the uploaded images (ordered by the information about the contact). E.g. contact A has these 20 images, contact B has these 15 images and so on. (On the public site the images and the linked contact data should not be shown).

Are there any plugins which I could use? Or how is it possible to implement this (especially the limited amount of images per category and form-request)? – Do I have to use a custom post type with custom taxonomy (for the image-category)? How could I link the images with the contact-information in the wordpress-backend?

Thank you!