@OKNET, I wrote up some notes from my testing of ZeroTier a little bit ago into a long forum posting here:
http://forum.mikrotik.com/t/zerotier-on-mikrotik-a-rosetta-stone-v7-1-1/155978/1
I can’t promise it’s 100% right currently, but does have a lot of background on how ZT works on RouterOS, at least from my observations/testing.