I don't think its like that. My understanding is that they will create a catalog with multiple services you can choose, and service provider will provide an unified API for those.

So you can take your prototype build on a server in $european_country_1 and publish it on the cloud of $european_country_2 once the dev is done without any change except the billing address.

If this is what you propose, this will be yet another stillborn project (Hey AI4EU!)