Anyway, about your main topic why not use some tools to calculate the ROI and the current earning daily with this unit model is around $50 if the electricity is not included yet.
Here's the tool that Im talking about
- https://www.asicminervalue.com/miners/iceriver/ks5l
Edit the electricity rate to see the deduction and take note this is for the current difficulty and the price of the coin it might change once the difficulty increases and the price of the coin drops or increases.
About mining unit if you are looking for other option then click the homepage from the link I provided above to see other miners.
In the meantime, thank you very much for your honest and helpful advice. I will look into it.