Birth particles on genarated bricks surface

[yuryb2cu]

Two ways I can think of:
1) You can use spawn operator, and within it's option, check to spawn on shape (or surface), rather then in center
2) You can add mesh operator, disable the "render only" switch. Now create second flow, and just pick first flow in position object operator.

Both methods works fine, the second one allows more control in particles placement 
Thank you very much¡¡¡