I wish I could vote comments up here, Brax - you would have gotten a few points from me already.

Now your answer was kind of unclear to me:
On one hand I asked whether I whould trade Z1 and Z2 separately,
and you said "yes, absolutely";
but then you added that I should run a Z12 for a while.

So do I understand you right, that I should run virtual demo trades with 3 separately installed Zorros (if that even is possible) :
Z1, Z2, and Z12 parallel, and then compare them after 3-4 months ?

I will try to install a second Zorro now and then try to find a good broker to go with (whilst I learn more about broking and coding of course).