How to configure unrestricted enrollment

Summary:

We have a requirement wherein the employee can do elections through out the year. There is no open enrollment period. The employee should be automatically enrolled into default plans on the hire date and thereafter he can make changes in the elections through out the year n number of times.

1. As per the documentation, I need to setup unrestricted life event. I'm doing the same at the program level at the enrollment tab. Wanted to know what should be the enrollment period start date and end date values for unrestricted enrollment in the below screenshot:

1. Also, when the employee is hired, the employee should be automatically enrolled into default plans. How we can achieve it?