Best secure certificate storage solution for on-premise or co-location hosting?

What do you use for secure certificate storage in your own solutions?
I'm trying to find a decent solution that isn't going to be an admin nightmare for the client. They use co-location hosting at their ISP.
Thanks in advance!
Ansible and Hashicorp vault are OK for most creds, but a HSM may be required, it depends on the value of the asset that you are ultimately trying to protect.
 
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