In all of the work I have done on the labels code, I have never worked with the 'alternating' layout option. I "think" this was originally intended to do this sort of label. That's what it looks like in the code at least. You could give it a try and see. I'm sure it will take some work at developing a template which will work correctly with the LSL04 set.

Give it a try and post back the results.

Kind Regards,
Chris