Question (short):
Where is the best place to make the most of Pi-Hole?
Many homes would have a similar network when you improve your wifi-signal. So, I'll try to talk as generic as possible.
Physical connection:
WAN --> ISP-modem (A0)
--> A1) Devices I don't control (thinking of decoder from ISP, ....)
--> A2) WiFi-router to improve WiFi-signal
--> A3) Pi-Hole
WiFi-router (B0) creates a network for all of my devices
--> B1) Devices I control (printer, pc, smart TV, IoT, ...)
Logical connection:
Devices from network B gets an IP from the WiFi-router (B0 = A3). The DNS referrers to the WiFi-router or directly to Pi-Hole (A3). Devices on network A gets an IP from the ISP-modem (A0) where the dns is referred to the Pi-Hole (A3). Pi-Hole itself referrers to internet-DNS.
Question:
How do I block ads on all the devices from both network A and B? Or should I forget network A and move Pi-Hole from network A to network B? Devices will be placed in network B unless it won't work.
Which device must refer to the Pi-Hole dns to make the most of it? Should the device itself have to point to there or can the router point to there?