Boqa

If you are going to host 2 or more servers on 1 ip address, you need to use port offset. Let's say the first server is running on the standard port 16261+32 players (for example) then the second server should use 16294 and higher. It is also probably necessary to reconfigure the steam ports. For each server, you need to configure the path to the cache directory using the startup argument -cache dir="path" (I use a translator sorry for the inaccuracies)

From my observations, for 5 players, it is enough for you to allocate 6-7 GB of RAM to the server. In the task manager you will see that it is used completely in reality it is not. This is how java heap works. You can use the java monitoring and management console to view the actual resource consumption