One thing to remember regarding your "free power". I expect there are limits on it as you mentioned, but furthermore, at a practical level a miner converts electricity to heat. A 1000W miner is just like a 1000W heater. If that is going to impact your living environment in some way, be aware of it. Some miners are also quieter than other, with the general being that the hight the wattage, the louder it is. If you are thinking of putting two S9 miners in a closet, what would it be like if you were to put 3 hair dryers, on full blast, in there round the clock.

Would that be a problem?