I would think of it as a short way of saying "each of these can be found on the fifth floor". Or one could say "you can find these on the fifth floor". Does that help?

It's not just the simple past form. It's also the past participle. In this example, the past participle is being used as an adjective. As Tapiwa said, here it's synonymous with "located."

Past participles (like "found") can act as adjectives. Whenever you use them in this way, you always create an unseen actor or cause (like "a person who finds or who found"). Here are some examples: "There is a BURIED treasure under the tree" Unseen actor: the person or thing that buries the treasure. "There is an INJURED boy on the sidewalk." Unseen actor: who or what injured him? "Sally is a DELIGHTED mother" Unseen actor: what or who delighted her? "A store is FOUND on the fifth floor" Unseen actor: who finds the store there? Answer: Anyone who wants to find it.

There are X shops on four different floors and Y restaurants and a cinema on the fifth floor. There is no need for ‘found’ here. It’s padding - from a marketing point of view saying something in a long way can arguably sound more impressive.

What would "all establish on the fifth floor" mean?