No EPower needed for class A since 290X Lightning is available.
1. Only AMD R9 models. So R9 290X reference or Lightning if you want to have a real chance.
2. The top 18 will go to the final. However maximum 1 per country (2 if 1 x A and 1 x B) and 4x AM, 6x EMEA, 5x APAC