Use diffrent model for users who login with django google allauth login

I am using Custom User model for only admins but I have to create seperate login sysytem for clients who uses django allauth google login system and these clients have below model:

class ClientUser(models.Model):
    username = models.CharField(max_length=50, blank=True, null=True, unique=True)
    email = models.EmailField(("email address"), unique=True)
    first_name = models.CharField(max_length=50, blank=True, null=True, unique=True)
    last_name = models.CharField(max_length=50, blank=True, null=True, unique=True)
    phonenumber = models.CharField(max_length=15, null=True)

    def __str__(self):
        return "{}".format(self.email) 

How could I make google allauth use this model?