Anybody using Pi-Hole with Mi Router

How do I configure my Mi Router to use a pi-hole DNS Server?

If I select the Configure manually option. Internet Speed Drops completely. Sometimes it's not even working.

Any other Possible way to Direct all requests?

On my D-Link I have set manual config and DNS1 is set to pi-hole IP.
That shouldn't affect speed that dramatically.
Secondary (DNS2) is set to 1.1.1.1 in my case. Not sure if that is necessary though...