Question about Wilfa Probaker

Small quantities also work very well. But there's nothing like stretch & fold. I make both

Yes, according to the manufacturer 500g dough.

I also work with 400g

It works wonderfully.
I have already made bread dough with 250g flour.
You may need to knead for two minutes longer than with large quantities of dough, as there is not much counter-pressure with a small amount of dough.
But be sure to check the dough after the normal kneading time.
Have fun baking your pizza!

As the container itself also rotates, it works very well.