Anyone experienced with 1070ti?

So I have an opportunity coming up, but I’m trying to gather information as to what I can get set up. I’m looking at a bulk purchase of 1070ti’s, and I’ll be setting up a brand new electric service in my garage to house a small mining operation. My questions are this…

At TDP, a 1070ti runs 180w, and I’m planning to build 8x 1070ti rigs. I haven’t found anything more recent than like 2-3years old about overclock/undervolt settings… does anyone here have experience with them and know if I can get them down to like 120w? 150w? This will determine how many rigs I’ll be able to support so I don’t waste money on buying too many…

Also, what’s the best place to buy ASICS from? I won’t be getting a lot of them, maybe 2-3 BTC and/or LTC miners since the ETH ASICS are like non-existent it seems…