It's not possible to use MERAKI Splash page to achieve requirement for the WiFI4EU program.
You need to host a custom splash page on your own infrastructure,
Spash Page > Or provide a URL where users will be redirected:
And integrate the EU Snippet code on this page
The splash page URL must contain the UUID of the WiFI4EU network, provided when you have completed an installation.
The snippet code is used by the EU to verify that you meet all the requirements, and process to the payment of your WiFi4EU project
Also a testimony of one of our project on the EU site :