How to start and hold -10X Multiplier - Days Gone Infinite Horde Challenge (Surrounded) Take:1

Here is my 100% multipler Run-    • Days Gone Challange  SURROUNDED  100% Kill...   I have found after you get up to 300+ kills the hard part is over and you can keep growing the Multiplier. I will post the complete clip of me starting and ending with 10x Multiplier, and will also work on 100% Kills as well. I would also like to find the record for fastest Gold?