Run sonarr and radarr on same port

I would like to run all of my service on the same port number. This is for internal network access I normally use a reverse proxy for exposing services outside of my network. However, as stated this is for internal use I want to be able to assign Sonarr, Radarr, etc to a dedicated ip address than put them on port 80. This does not work for some reason a user talked about this before. This should work since they are being binded to a dedicated IP address.