Port Forwarding with multiple servers

Hi, I want to host multiple servers, and the wiki says I need to forward these:

UDP 1200 1200
UDP 26901 26901 (This will allow the server to show up on the master server list.)
UDP 27000 27015
TCP 27020 27039
UDP 27015 27015 (you may not be able to open this one, but it is suggested that you try)
UDP 27020 27020
TCP 27015 27015

So I did, but I realize this is for one server, which other ports do I forward if I want to host 2 more servers, so that’s 3 servers in total. I want to space them 20 ports apart as I have heard this is the best configuration.

Or just port forward 2700-2750 UDP & TCP.