To stop Symbiosis trying to generate SSL certificates, you'll need to set
false. You can then add the third-party SSL wherever you'd like - perhaps
/config/ssl/comodo/, or whatever helps you identify it amongst the rest.
An Apache SSL vhost file might look similar to this:
SSLCertificateChainFile isn't strictly required (and is deprecated as of Apache 2.4.8). The
.key should be provided by your SSL provider (or sometimes a
.pfx which contains all three of the above files).
You shouldn't need an extra IP thanks to SNI, unless you're using a version of Apache older than 2.2.12.
Once you've manually modified the site's Apache vhost file, Symbiosis will skip over it when
symbiosis-httpd-configure is ran, unless you append the
--force flag - you'll likely not want this vhost file to be overwritten by Symbiosis, so it's worth bearing that in mind.