Services required to setup Tacker

Hi,

I am a newbie to openstack. So sorry if I am asking any silly question.

I am installing tacker through kolla-ansible by referring below link.
https://docs.openstack.org/tacker/latest/install/kolla.html.

I already have Openstack staging environment ready(Queens Version) for VM deployment(VIM).
I am installing tacker on separate baremetel server.

Can anyone tell that the minimum services enabled in global.yml mentioned on the installation guide, are sufficient for tacker.

enable_glance: "no"
enable_haproxy: "no"
enable_keystone: "yes"
enable_mariadb: "yes"
enable_memcached: "yes"
enable_neutron: "no"
enable_nova: "no"
enable_barbican: "yes"
enable_mistral: "yes"
enable_tacker: "yes"
enable_heat: "no"
enable_openvswitch: "no"
enable_horizon: "yes"
enable_horizon_tacker: "{{ enable_tacker | bool }}"

Note that the VM will be initiated on the already available openstack(Queens) and need to setup tacker only for VNF,NS,VNFFG deployment, termination, monitoring(All basic functionalities).

There in note, mentioning "This installation guide is explaining about Tacker. Other components, such as nova or neutron, are not covered here." And nova and neutron are turned off in global.yml.

1) Does tacker require its own nova and neutron?
2) Also does tacker and the VIM/openstack require to be in sync in terms of version. E.g. if openstack is of queens version, does tacker also required to be in same version. (I have tested with advance version of tacker, and able to create VNF, but facing some issues in monitoring)

Thanks in advance.