Shared mailbox read-only access with hybrid environment

Hi All

I am using exchange 2013 hybrid environment, my all users are in cloud and we do not have any users in on premises, we create users in on premises and migrate to cloud.

I have a few shared mailboxes on cloud which I need to provide calendar access to more than 10 users. If I go with security group on exchange on premises, is it possible to give read-only access to this shared mailboxes calendar or I have to go with mail enabled security group on exchange on-premises.