You can surely install SSL certificates for multiple domains on our hosting servers due to the SNI technology available on them. SNI technology allows having multiple certificates installed on the same IP address. You can check more details about SNI in this article.
If you have hosting with us, you can have unlimited number of certificates installed in your cPanel.

If you would like to secure several domains, there are a few options possible.

1. The first option is to purchase separate single-domain certificates for every domain/subdomain. The list of single-domain certificates can be found here.
2. The second option is to purchase a multi-domain certificate that can include various domains and subdomains in it. Please keep in mind that the installation process should be done for every domain/subdomain included in the certificate. You can check for multi-domain certificates here.

*If you need to secure all subdomains of one domain, i.e., www.yourdomain.com, login.yourdomain.com, checkout.yourdomain.com and all others, you can get a wildcard certificate. Such type of certificates should be also installed for every subdomain you need to get secured. Wildcard certificates can be found here.

If you already have a dedicated IP address assigned to your hosting account, it is still possible to install multiple certificates in it. This dedicated IP address will be displayed for all certificates installed within your hosting account. Basically, only one certificate will be installed on the dedicated IP address, while other certificates will use SNI option.