Vermin eliminations for camps.

Hi group. I'm new to zombies and I've been out of the COD games since BO3. Got all guns up to the point were I need Vermin kills before I can get the gold camos. I've just taken one solo run on terminus and it's huge and confusing compared to Liberty falls. I'm on round 10 and I've backed out and saved with 7 Vermin kills to show for it. Any tips to get more Vermin kills? For example stay on a particular round, location, etc. Any help would be awesome. Thanks all