Installation of the Syndesis CRD fails, because PV's need to be provided. This is  a prerequisite in the official documentation (https://access.redhat.com/documentation/en-us/red_hat_fuse/7.7/html-single/installing_and_operating_fuse_online_on_openshift_container_platform/index#register-custom-resource-definition_install, access mode is missing) but not documented on the OLM page for Fuse Online.