I'm going to give some advise on your soil.
You dont have soil it hasn't been there for thousands if not millions of years.
As for the raised beds here is more of what I would call sound advise.
You have salts in your soil and a high water table.
This is what is going to happen.
You put down a mound of good soil and the water you use will come into contact with the water that is already there.
The salt will literally climb its way into the good soil you put on top by capillary action and ruin it.
You wont be able to leach out the salts because of the high water table.
It wont be no time at all that all of that good soil you put down will have salt crystals on top.
What I would do is create a barrier between the bad salty soil and the good soil you put in.
This would mean a raised bed with bottoms on concrete slabs or at the very least a good double layer plastic vapor barrier in between.
You can even put the mounds you speak of on the vapor barrier without the raised beds with sides.
Worth
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