My router is a Netgear Nighthawk RAX70, Router Firmware Version V1.0.15.146.
I went to the ADVANCED tab, selected Setup->Internet Setup, then selected "Use these DNS Servers" and entered the address to my Pi-Hole in Primary DNS (Secondary and Third DNS addresses have been blanked)
Expected Behaviour:
I go to speedtest.net, and I expect to not see ads
Actual Behaviour:
I go to speedtest.net, and I see ads