I think you must test-drive your 1-2 rigs that will arrive, and decide bit later do you really need all other rigs, also you need to see can you maintain rigs, there are many underwater stones in overclocking/undervolting, power delivery, thermals, cleaning etc. if this rigs will be produce zero problems to you, then go on for more 
I have 2 technicians who will take care of all the technology.
I know that you have to pay attention to a lot of things and I will plan everything carefully and take it slowly.
i will let the first rigs run for 2 weeks, write down electricity consumption and income every day.
yes the electricity is really cheap in north macedonia, unfortunately it is an undiscovered country. There is a lot of potential in it