Physically locating GPU Servers at Massive Scale

right now i just have one pc with 2 GPUs on it (a R9 390x and an RX470) … i just started mining less than a couple of months ago … but been thinking of building a farm … would start with 10 rigs with 6 GPUs and upgrade them in 10s every month or so maybe … looking at building 50 rigs if i can find funding :))