OK lets resize this, to give us something to play with. the dimensions are not critical !!

Now create a null object to hold our xpresso settings and to control the position of the emitter. Right click on the null and add an xpresso tag

Now drag and drop the null object into the xpresso window

Click on the red output port and add ports for global position and global matrix

Add a PStorm emitter

Add emitter alignment and emitter position ports to the input side - blue box

And connect the relevant ports, the global matrix goes to the emitter alignment