For you use case, I think the best license would be Power Automate Premium license which is a Per User license but please note is you are triggering the flow from a Power App, then all the users who will interact with the app should have a premium license too as flows triggered from the app run in the context of the user.
You would be able to develop your flows using Power Automate Premium license and then transfer the ownership to a Service Account or Service Principal.
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