I am using 5 accounts per proxy with 4 shifts per day (8h shift) so I am using 20 accounts per proxy per day. They're rotating proxies so every shift I get a fresh new IP so the new shift won't overlap on the old proxy. Shifts timings are synced with rotation timing so everything falls down in place smoothly.
Yes, that's right. If you have a 50k+ account that gives you $100+ per month and still growing, then you want to be the safest possible. I am not doing that, I keep minimum of 3 accounts per proxy (9 per day) with my high-quality accounts, but there are people that want to play it safe.