Not too late for sure. I'm looking for exactly this type of information. Few killed devices is not a problem.
There should be a reason noone has done no neutral shutters controllers - at least I couldn't find any.
It was just my curiosity if this can be done with 1Ls that are obviously not meant for that. But probably not a good idea anyway.
Yeah, that's clear, but I don't have much of a choice. I would like to avoid breaking walls for now.
I'm willing to try it anyway 
My first attempt was not so fun - I burned the one of the Shelly's. Wiring them one by one seems to work fine, but when I wired them together, not the one running, but the other burned. That's all without wiring a physical switch. I'm still contemplating on the possible reasons. Maybe I didn't wire them in the best way. Or the one that burned was still on. I'm not sure yet. Playing around.
I was just wondering if anyone have tried something like that.
Thanks for the answer.
By mutual locking you mean the possibility to turn them on at the same time? I'm not so deep into the ecosystem yet, but I was hoping it's possible to programmatically shut the one down before the other starts.
Hello,
I have a shutters switch with L, Up and Down (no N). I'm thinking about automating it with two 1Ls - one for Up and one for Down. Any thoughts and potential problems? And how should I wire them?
