HTTPS SSL CA deployment

Hi All,

I've decided to give HTTPS scanning ago, however, when deploying the certificate via GPO it's intermittently working. Sometimes gets removed etc or even though it's there, the websites still giving security alert page on chrome. 

I'm using Cyberoam CR50ing and many different client sites

Keen to understand how people with hundreds of computers are deploying the SSL CA to machines? What's the best way without manually importing it to every single computer?

Thanks