I understand.  I think you said you have free electricity too.  I don't know how technical you are though.  If you know you are going to have to spend +/- 20 minutes a day and occasional downtime to make these work and think that lyra2rev2 will stay profitable for at least 6 months (and the coins won't fork) then go for it.  But it is a high risk type of decision. 

I purchased 6 Z9 minis with the first and second batch, and they have almost paid for themselves and could still sell them if I wanted... so sometimes it works out.  Maybe this one will, maybe it won't but I am banking on bitcoin (because I use nicehash) going back up in the future so that will help my overall profit.
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Thanks for this feedback, what daily profitability are you getting from the Z9 mini’s? The price has dropped and Bitmain has them for $630 + $100 for PSU and delivery. I can get 4 or 5 of these hence the question.