Possible issue when running NextDNSCli on router and app on local computer altogether

Hello currently

• Running NextDNS Cli on router
• Running NextDNS app on my computer because of apple private relay

both use same configuration and wondering it would cause any issue such as duplicate work from both side and so on.

The reason why I run app on local computer is because it is necessary to make NextDNS work as full time ad/tracker blocker.

Expected behaviour would be 

• Local app on computer has a higher priority and 
• NextDNS Cli on router should NOT do anything or discard any enquires.

Wondering if this is how it currently works or has any other issues ?

Thanks