If you use multiple sub domain for different environment (development, staging, production) you can also choose wildcard SSL so you can use one certificate for

If you use multiple sub domain for different environment (development, staging, production) you can also choose wildcard SSL so you can use one certificate for *.yourdomain.com SSL Labs' SSL test (https://www.ssllabs.com/ssltest/ https://www.ssllabs.com/ssltest/) does not use certificate type (domain validated, org, EV) as criteria to get higher score.