SAN Applicability?

My domain is:
My web server is (include version): Synology (current version)
The operating system my web server runs on is (include version):
DSM 6.1.5-15254
My hosting provider, if applicable, is: DNAP
I can login to a root shell on my machine (yes or no, or I don’t know): No
I’m using a control panel to manage my site (no, or provide the name and version of the control panel): DSM 6.1.5-15254 Control Panel
We are attempting to configure secure OpenVPN access to our Synology NAS device using a Let’s Encrypt certificate on the NAS. We do not have a static WAN IP address. If we configure the VPN access using Synology’s DDNS service (“”) to point to our current WAN IP address should we indicate that as the primary Domain name during certificate creation and include as a SAN entry…or the other way around…or ?? We’re hoping that will work to avoid the ongoing cost of a static IP address. Thanks in advance for your advice!

You should include only the hostname that actually points to your NAS, which in this case sounds like

Will do. Thanks for the answer!

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