Rate limit for IP Address

im gonna to enable rate limit for some login url 5 attempt in 1 miniute, but here we have a problem, ISP provide 1 ip address for maybe 200-300 device at a same time with NATing, is it possibe to block IP when its use with same device???

Are they really? I’ve not seen this, as many services depend on IP addresses to identify users. If this is true, then Cloudflare can’t rate limit one user behind a NAT.

But if you do enable that rate limit, do you really think that 200-300 devices need access to your login at the same time?