Particle Position

Good day,

I am trying to generate particles from the factory colored red in the picture below; however, the particle (spherocylinder) is actually extending out of the factory as seen in the picture below, and this is not what I want.

I tried out using the lattice option (cubic, bcc), as shown in the picture below, but my particle stopped generating after placing the factory with the lattice, as seen below.

Please, how can I ensure my particle is generated from a fixed position from the factory? I do not want it to extend out.

Thank you.