What is the best way to install kali on QubesOS?

Dont do it.

You’ve only driven family cars, you’ve just acquired a supercar, and
you’re trying to bolt on a turbocharger.
There’s every chance you will end up on YouTube for people to laugh at
with your supercar fail.

Take a step back.
Unless there’s some extremely pressing reason you must have Kali,
don’t. (By must, I mean, your life or your job depends on it.)
Spend some time using Qubes, understanding how it works, and what you
can do with it. Look to see how you can split up your activities between
different qubes.
Read the fine documentation, and practice.

Once you are more familiar with Qubes generally, then you will find that
things become easier.
In particular you will find that many problems that people have in Qubes
are actually not Qubes specific.
You will find many guides online to help you, and you will better
understand what parts will be Qubes specific, and how to deal with them.

I never presume to speak for the Qubes team. When I comment in the Forum or in the mailing lists I speak for myself.
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