Locks for mobile phone and TV setting

Regarding Next DNS I think I have found a solution: on private dns in the mobile phone settings I put the name of the mobile phone model and next DNS ID. I now indicate the fictitious names of the mobile phone and the ID of Next Dns "12xbc" and "abc123" I then wrote in private dns: "12xbc-abc123.dns.nextdns.io". Doing so I noticed that there are no longer unidentified devices, it seems that there are blocks for the mobile phone both for the data network and that the wi-fi is connected. Is it therefore not enough to put only on the private dns "abc123.dns.nextdns.io"? Is it therefore necessary to indicate the model name of the mobile phone before the next dns ID for the blocks to be there and indications in the log? Now, however, a doubt arises to me: on the TV I put the dns server number indicated on Next DNS installations, I notice that although connected in wi-fi to the TV neither on logs nor on statistics I notice indications of the TV within next DNS.

In order for this device (TV) to actually have the blocks and indications of the log, I don't think it is enough to insert the DNS server on the TV, so instead of putting the numbers indicated by the DNS server fictitious number "45.50.28.150" I should put the model of the TV for hypothesis the model of the TV was "lg123" and report in the settings of the TV this string for example "lg123-dns.nextdns.io"?

Kind for the attention given and for the feedback given