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Regarding issues 1) yes you will have to add a CNAME record towards your public ip address or DDNS name of your NAS. This is the first step that you have to do in order to push visitors towards your NAS and shlink instance.
Next, you will have to set up a reverse proxy for your bjsa.cc domain and redirect it to your shlink container.
More on this here: Synology Reverse Proxy
I don't have a certification for bjsa.cc. Is imperative to get one, and if yes, could I create it at synology?
Regarding question 2). Can’t you simply log into those servers and use the delete link on the page to remove them?
Unfortunately not. This is the problem I posted more above. Here is a gif showing the issue I'm talking about.