1 - According to the tests that have been done, what are the best parameters to run z1 and z2?

I understand it are:
Margin = 50
Risk = 10

Thus for both scripts?

2 - How do I run z1 and z2 simultaneously on the same account? I need 2 PCs or 2 VPSs? In this case the parameters change with respect to the previous point?

Thanks.