You can use the contact and motion sensors with the hub without a HMS subscription… You just will not have any access to or use for the monitoring tab since there is no professional monitoring. There is no self monitoring option. I don’t believe you will be able to use the Disarmed\Home\Away functions without a subscription. Someone here will be able to confirm that.
All the sensors will need to be set up for notifications on\off thru a rule so you get a push notification if any are opened while you are away. If you program several rules, you can use them for disarmed\home\away but you can’t assign on duty and off duty without the monitoring tab.