I just installed the first EM3 last weekend and the manual stated to put the amp clamps from K -> L which states K as the power delivery and L as your home consuming power.
I did exactly that an installed the clamps between the first fuses and the grid power meter.
The values itself are correct or at least seem to be correct but the prefix is wrong - the shelly app shows a 25kwh consumption and 4.5 kwh returned. But it's simply the other way round. The PV delivered about 30 to 35kwh and in the morning the house consumed about 4 kwh.
So the values match the values on the meter but the app shows the consumption as "returned" values.
I'm sure I didn't mess up the direction on of the clamps - is there anything else I could have done wrong?