I don't think there is a setting for sunrise or sunset in the rules yet (just specific times).
I do have the Linear equivalent of those two devices you mentioned, so I can't comment specifically on the brand you mentioned, however...
I installed Linear FS20Z-1 (similar to LFM-20) as a garage door opener and it works perfectly. I had to adjust the antenna a little (aim it away from the metal tracks of the garage door) to be reliable, but it has been perfect ever since.
I have also bought (but not installed) the WO15Z-1 (similar to LOM-15), so I'm not yet sure if it works yet.