Celitech is the world’s 1st digital-only cellular data platform enabling online businesses to better engage with their customers. For further details: www.celitech.com
We at Celitech (www.celitech.com) have been working with hospitality partners to offer cellular data for travelers and have seen similar concepts but on long-term agreement basis, which might be restricting this market. The platform suggested here, offering short-term space rentals for product ads or demo's can create many new opportunities for a wider variety of businesses who'd find such concept more feasible. To validate this concept, you may want to build a minimum-viable-product which can be a basic website that you can test with targeted customers and space providers. Besides the website and its UX, you need to make sure that whatever ad/demo material your customer wants to show is totally compatible with the space where it'll be used. Once you have a couple "wins" you can expand, and while initially the service trial can be free, once you prove it is viable for both ends (the advertising customer & the space provider) then you may consider charging a commission on the space rental fees. Additional services you can offer later to your customers are ad/banner/demo designs & prints that would fit your listed spaces.
Clones don't look professional to your customers and may not allow you to try and test different features. If you're not a web developer, creating a website from scratch can be challenging but you can select a website builder online (for a minimal charge) to swiftly help you build your own website (with no coding).
You may want to check what facebook did in this space and why it didn't work so far: https://www.nytimes.com/2018/06/27/technology/facebook-drone-internet.html