I have now been staking for one week with a Micronode, and I have had zero income. I am pretty sure that other nodes, like the one that was on the north of spain, have gone offline for the same reason. To make it even worse, they market the node as having "two times the necessary UTXO to stake", but what they dont tell you is that there is a cost associated to splitting the UTXO, and that if you decide to split it without any income, you will end up with 100 tokens on one side and 99 tokens (which are insufficient to stake) on the other, making the situation worse than if you had not splitted it.
In other words, stay away from the micronodes for staking as they do NOT provide rewards. Buy it if you want the 200 tokens, and then just claim them, backup your wallet, reformat then nanopi 3 sd and use it for any other purpose than staking.