Mapping inheritance in EntityFramework Core

I'm using EntityFramework Core, Code First and Fluent Api to define model database, and i've follow situation about strategy of map inheritance:

public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class User : Person
{
    public string UserName { get; set; }
    public string Password { get; set; }
}

public class Employee : Person
{
    public decimal Salary { get; set; }
}

public class Customer:Person
{
    public long DiscountPoints { get; set; }
}

Business logical

In this case, users, employees and customers are people, however employees and customers are also users, as well as an employees can become a customer. And each type is used in distinct appication contexts.

I implemented this way to not use values from other application contexts unnecessarily.

Questions:

1. What are the best practice to map a database model? Type-Per-Hyerarchy or Table-Per-Type? a. If TPH, how to use discriminator field to many types? b. If TPT, how to use this strategy in the EF Core 1.0?

2. Is it the best architecture for the business model?

thank you for your attention and collaboration