Health Insurance

Hi guys hope you safe.
okay the purchase of our house in South Africa  is in last stage probably this coming week we get news.

As part of our planning we looking at health insurance  for expatriats .
Am so confused on the best one which  suits my family 2 adults and 2 kids. And we also planning in the future to extend our family once more.

So my question is which health insurance will be best for us, flexible to alter for since
i) martenity benefits will be in need for me ,
ii) For my family be able to be  treated to any private hospital in South Africa
iii),less or not copayments requested from us ,
iv)best to respond in time of need ,

Please help as we cant fall under the medical insurance in South Africa.