Best Way To Farm Breaches?

As the title says I am looking for advice on the fastest way to farm breaches?

I have a Zana 8 so I am assuming just dropping the chaos for her breach mod is the best way to go so here are some specific questions:

1. What is the best map to use Zana's breach mod on?

2. Is there a tier range I should consider (i.e. only above tier 10 or nothing below tier 14)?

3. Is it worth it to run the mod on corrupted maps or should I just stick to non-corrupted maps?

Thanks guys!

im surprised you cant answer these yourself considering 30 challenges

best map would be one with open terrain, least amount of dead zones for the breach
the higher the tier the better and with elder or shaper influence
only if sextented well do i believe it is worth to corrupt a map and pay the added vaals when running zana mods