This is what I do as well. I use acme.sh on one linux server to generate a cert with a few SANs on it, then copy that cert to things like opnsense/truenas/etc

This is what I do as well. I use acme.sh on one linux server to generate a cert with a few SANs on it, then copy that cert to things like opnsense/truenas/etc either using ssh or their api if there is one.