One IP on each of those platforms, I would say the upwards of 5 or so. Depending on how you go about it, there could be more or likely even less. I'd recommend just buying accounts, but with only one IP, that's gonna be a waste. Invest on residential IPs (mobile proxies, in particular but your pick), use them on top of anti-detection browsers, and access the accounts with a well thought out plan. Also, try to fan out the account creations over the day or so instead of all at once unless you're set up for that.