Save money over buying individual certificates - certificate Comodo SSL UCC SAN/Wildcard DV secures even 210 domain names.
Certificate is issued after checking the ownership to domain name (DV). This is the fastest way to get your SSL certificate.
Type Wildcard SSL protects an unlimited number of subdomains (eg. panel.ssl4less.com.au, a.ssl4less.com.au, b.ssl4less.com.au, c.ssl4less.com.au etc.).
Sectigo (formerly Comodo CA) SSL UCC SAN/Wildcard DV is especially dedicated for businesses that use MS® Exchange 2007, Exchange 2010, Exchange 2013 and Office Communications Server 2007 and they want to secure a single FQDN domain name and Wildcard with a single SSL certificate.