Hory shet, so there is people that actually do this? I dont pay electricity either but just because its included in rent, i would love to do this too,im also willing to be completly transparent, i live in sweden.
Sweden, Norway in the past and Iceland sometimes have the power fee within the house rental, but they are most time limited.
One S7 is supposed to run on a 10A fuse (@220/230V).
In fact you can let run 2x S7 on a 16A fuse, but it has to be a fuse with special starting current. (sluggish is maybe the word; didnt know Tech. word for it - I just know how the power curve has to look while turning on the power - not a normal house fuse!)
If you use a normal 16A fuse and your power maybe went down for maintaince (can happen anywhere in the world) and the power will come back after 1 minute ... BOOM! ... dark
Maybe if you can do a delay of 30s between them it will be fine, too. (SSH / Telnet => Linux => possible without hardware costs)
1) How many dedicated power you have free?
2) You want to stay living there? Think on the daily peaks in the morning or afternoon you will need for a normal day (without mining). Either you do a shutdown if you need more power for yourself and an automated power on if you free the power again --- or you have to calculate fix with the peaks!
But ofc if you have free 10A / 16A / 32A --- use it for 1x, 2x or 4x Antminer S7.
Even if it gets more and more unprofitable -> without any power costs you cannot loose.
And at the end it can warm up your house a bit on winter days (if you connect it smart).
You cannot LIVE next to those miners. Your ears will start to bleed
You need a special room / downstairs or a container in your garden