How is Reverse IP, PTR, rDNS configured on a home server?

Hello, I am somewhat confused with Reverse IP, PTR, rDNS and I have these questions:

1. Do I need to configure the PTR?
2. How should I configure the PTR?
3. Can I configure it on the router?
4.Should I call the internet provider?
5. Can I configure it with the domain name provider (Godaddy)?

I have in my house:

- Raspberry Pi 4 4GB
- Raspbian Lite (SSH)
- LAMP configured
- Postfix configured
- SSL configured
- Godaddy (domain.net) ==> https://mail.domain.net
- DMZ configured router and open ports (I have access to the router)
- MTA-STS, DMARC, DKIM, SPF, X509, CA, StartTLS, configured well
- The emails work perfectly, I receive and send perfectly

Internet - Router - Raspbian

Example with name and fictitious number:

Code:client@debian:~#host 200.210.60.50
50.60.210.200.in-addr.arpa domain name pointer d200-210-60-50.th.internetprovider.net.With the test I only see the name of the internet provider.

But I don't know where or how to configure the PTR on a "home server" test?

Thank you