In migrating our site from non-SSL to SSL, is there anything we need to reconfigure in DTM or analytics? So far, the only thing I think I need to change is the URL field in the web property configuration from http to https.
There is a good article for your question here. Depending on how your server setup is, you might have to tweak a little bit in the library or not at all. Have a read here: https://helpx.adobe.com/analytics/kb/determining-data-center.html
Correctly populate the trackingServer and trackingServerSecure variable