Run the T6 Servers in Pterodactyl/Wings.
Run IW4M Admin on the host machine or another machine.
I had a lot of trouble with setting up my bunch when using IW4M inside a node.
Running for about 6 months no issue.
I use Stefanuk12's egg on github for the T6 servers.
And IW4M-Admin master from RaidMax's repo.