Standard SSL MultiDomain
Sectigo (formerly Comodo CA) Standard SSL MultiDomain offers domain validation (DV). It is a solutions for securing anywhere from one to three domains on the same server under one SSL certificate. There is a Wildcard possibility, however, so you can protect a total of 210 addresses - both domains and subdomains.
For example, a single certificate Sectigo SSL Standard MultiDomain used to protect the main domain: