Again, please look at the admission requirement. I've impression that all B-schools in France only accept GMAT. If you are not sure, or you think there's a chance, please confirm with admission offices, not me!
1. I see many people of these programs find jobs /internships in HK. But 90% within French companies. If you are targeting American /British firms, then I would say French degree is not competitive at all.
2. No problem.
3. I would explain this way, Paris top 3 help you to land a great internship in France, great internship helps you to get a great full-time job in mainland. but a degree in Paris Top3 will not automatically generate anything for you.