"Several hundred other domains" is factually inaccurate. At most, there are ~40 other zones on the certificate (typically, far fewer). The challenge here is IP

"Several hundred other domains" is factually inaccurate. At most, there are ~40 other zones on the certificate (typically, far fewer). The challenge here is IPv4 address space; we don't require SNI for paid plans -- cert will be returned even if server_name is omitted from the TLS ClientHello -- so we must assign these customers dedicated IP pools. We're actually in the progress of migrating all paid customers to their own certificates, so this issue will go away soon.