Disclaimer - i don't use IOS. Instead I use windows and PerfPro Studios. But hopefully this works for you:

1. Use TrainerRoad or Zwift (not both) - connect Kickr via BT if able. Otherwise, use Ant+.
2. connect quarq via ant+. You may need to use the ant+ dongle that came with your power meter.
3. Use "PowerMatch" or similiar feature, which essentially uses quarq data to control your Kickr resistance. The name of the feature may vary slightly depending on service but that is what you want. This assumes you trust your quarq PM data more than the kickr PM data. Though for me personally, I like consistency so since I train outdoors with my Vectors, I want to use Vector PM indoor as well.
4. connect any other sensors you need. HR, etc.
5. Have fun.

You'll notice I don't include the 520 in there. The 520 is not part of the ideal set-up since as long as you are using TrainerRoad or Zwift or another software program it is mostly useless, though perhaps it might give you some data points you like such as 10s average power. if you really want, sync your quarq power meter to the edge 520. Don't bother with the kickr since if you are using the PowerMatch feature then it is the quarq data that you're really interested in.

Also note the Kickr can do BT or Ant+ simultaneously. So it doesn't really matter which way you connect to it. Just don't try to set it up to TrainerRoad and Zwift at the same time trying to control it.

Good luck!

You'll notice I don't include the 520 in there. The 520 is not part of the ideal set-up since as long as you are using TrainerRoad or Zwift or another software program it is mostly useless, though perhaps it might give you some data points you like such as 10s average power. if you really want, sync your quarq power meter to the edge 520. Don't bother with the kickr since if you are using the PowerMatch feature then it is the quarq data that you're really interested in.