I'm sorry that I'm a little late in the responses here because I'm reviewing the plan I'm going to make, I'm a little wrong at this point about what I'm planning to buy. But here at nicehash, It seems to be okay and I got interested in this matter. And I think the NVIDIA Tesla A100 mining hardware is the best based on my review on the website you provided.
I hope you've read the disclaimer which state you actually don't mine Bitcoin. Additionally the article is slighty outdated since newer GPU type (such as RTX 4000 series) exist.
Check electricity price on your area and reserve location (e.g. your basement) to host your mining
I have a small stock room and I will put an aircon before I begin to host mining here.
Sounds good. Many miner use such room. I hope your electricity price is rather low ($0.06/kWh or lower).
Here is the place I am in I think bitcoin mining will not work here, because the per hour I consume in electricity is around 0.3kWh.
So if a miner has 3000W its kWh can play 3kWh x 24hrs a day and it is at 72kWh per day, it is too high for me because my consumption in a month at my house is at 230kWh and that is around 40$-50$ a month. So I will only lose if I do that.