Since you have the high budget min 5 mil, you just search from property website and arrange a viewing, the neighborhood is noone can give you the answer, as i know few super rich man , they stay in their old neighborhood, their son and daughter also bought and stay nearby , it is not about good or bad neighborhood, is about whether any good subsales unit available in the super rich man area.

For new area such as Elmina , it will be less amenities compared to mature area, but all the specified requirements didnt list down, so noone really know your own requirements, example.distance to KL, 30 min diving distance if during working hour, you need find other nearer location but not elmina

I know for new area, normally the landscaping is nicer, but it is not the only concern, some people prefer to have a good school nearby, don't think rich man only send their kid to international school, i know one of the SRJK C is famous for rich man, the rich man is not millionaire level, is mucj higher than millionaire.

Anyway, with your budget, just search from.property website, and contact the agent, they very happy to serve you for multiple house viewing, then you can also observe different area and feel it. Some unit and area when you visit, you already have bad feeling, even if the unit is in good condition, the area is quite clean, just skip this kind of property.