ATV3 and PlexConnect remotely

Can someone post detailed instructions on how to use the ATV3 with PlexConnect remotely.  I already installed the cert on the ATV.  And I know DNS and HTTP port have to be forwarded to cpu running PMS and DNS intercept.  Also, it is not possible to have a local instance of Plex Server running where the remote atv3 is.  The ATV3 is installed in my car and I am using my Iphone as a hotspot for the ATV3.  I tried VPN but the hotspot network can not access my VPN net at home.  I have no problem opening the necesary ports on my router as security is not an issue.  I think i have to edit one of the settings files to allow from public wan.  If the ATV3 had a built in VPN client it would be as easy as pie!  Or the vpn client has to be in between the hotspot and ATV3.  

Forget it.  I will be using the Plex app on my iphone and airplaying it to the apple tv.  Wont even have to use the tethering data.