Change default custom Dashlet Positioning

Hello,
i’ve created my custom default dashlet with 2 modules and 1 external sites in custom/module/Home/Dashlet… which works fine and let me control also height and autorefresh features.

However i’m not able to find a way to change the dashlets positioning in any file.

Example:
Fist -> module 1 on topleft
Second-> module 2 on top right
Third-> relative on bottom and if possible double width of 2 above.

Something like that:
–Module1-- --Module2–
-----------Module 3---------

In a way like editviewdefs or listviewdefs or similar…

Does anybody knows how to do that?

Thanks