remote desktop licensing server 2012

Hi,
We have a 2012 server that we have been accessing thru remote desktop and it keeps warning about the grace period for remote desktop expiring in certiain amount of days which i have seen in other terminal servers before.  I was told by dell support that this particular server we purchased 4 5packs of terminal server cals so total of 20 for the server and since we chose the per device option when it was set up, that there was nothing needed for us to do as far as licensing since we had the physical cals, however the server shows as being activated in licensing manager.  It also warns that we dont have any brokerage server set up but since this is our only terminal server, i was also told we dont need to install brokerage connector server unless we have multiple servers that require remote access.  What is the correct way to handle this so we dont get locked out of remote access in a month or 2 when the grace period expires or is it actually accurate that since we have per device option, no need to configure anything with licensing server.  Thanks.