I'm not sure about with Apple (although I suspect it will be the same as it's chrome driving it) but I found that I couldn't watch US netflix easily with chromecast. It doesn't use the proxy settings from your laptop but rather direct to your router so you need to either set up a proxy/vpn on your router or create a hotspot on a device with a proxy/vpn and connect the chromecast to that.
I'm not sure about with Apple (although I suspect it will be the same as it's chrome driving it) but I found that I couldn't watch US netflix easily with chromecast. It doesn't use the proxy settings from your laptop but rather direct to your router so you need to either set up a proxy/vpn on your router or create a hotspot on a device with a proxy/vpn and connect the chromecast to that.