Just start a regular teamgame and activate the Domination Mutator in the advanced options.
Then make sure all maps you are running have a DOM config. UTeamFix stores all server side configuration in the Unreal.ini (or replacement of it), but Domination is an exception - the ini used is "UnrealDomination.ini".
You should cycle through all your maps once to confirm they all have an entry in that file. I will release a reference file for the standard maps, but if you use customs you will have to create your own configs.
The score limit will be whatever is configured as Fraglimit in your team game settings. Don't worry, kills and deaths will not influence the scores, the mutator will take care of that.