Single wild cart cert for all f5 external VIP

Hi,

Yes, you can use only one wildcard certificate (*.example.com) for all your virtual servers. You can even have only one virtual server and select the pool you want to forward the traffic to based on the hostname via a LTM policy our via an iRule.

About recommendation, I don't know on my own if there any. The only thing I see here is a higher security risk in case the private key is leaked as all your sub-domains gonna be at risk, but this is quite the extrem :)

One security recommendation I would give you is to set a password on your private key when importing one in F5 certificate store.