@mehdi
Your arrangement can be roughly represented as:
MMM MMM
WWW WWW WWW
- ignoring the top right Windows screen for simplicity.
Synergy effectively treats the three Windows screens as a single monitor, and the two Mac screens as another single monitor. So, the left-most Windows screen is effectively one-third of the "total" Windows monitor; when the cursor leaves this screen to the top, you want it to enter the right-most half of the "total" Mac monitor, and vice versa when moving down from the right-hand Mac screen to Windows.
I think you