If you do read back, you'll see that I'm all about the economics when making choices. I can't see any situation where T9s make sense (and I'm a guy that bought S7LNs [after S9s were released] and turned them into 5.1TH "S7"s). I'm sure you'll find those that are anti-S9 and will say that the added expense of the T9 is "worth it" for the "reliability"; however, if you do the math, every "bad" S9 found on Google, found on Bitmain's forum, and found on some random blog/forum added together likely equals less than 0.1% of units sold.
Given that you have the background, my suggestion would be to get the place (rent, buy, etc.), get it set up for what you think is your max (i.e.,most watts you can pull, most air you can move, etc.), and then, if you envision running 10, buy 10 S9s and let them do their thing. The only real difference between GPU mining and now is that ASICs have cgminer already on them and it's accessed/"controlled" via a browser (in over-simplified terms, an S9 [or the like] is a self contained PC and the ASIC cards themselves are the equivalent of what was, then, the GPU).