I use it on a Raspberry Pi 2B and Orange Pi Zero, both work wonderfully for the task, and it looks like Pi-Hole can work fine even on a router. Both of my SBCs are passively cooled, that’s why I decided to comment on the photo: you don’t need a computer this powerful to run it. As far as I remember, my very first Raspberry Pi (v. 1B or something like that) handled this task very well too. I temporarily retired that SBC in favour of Orange Pi Zero, so I cannot say for sure, but I think that computer had no issues with being fast enough for Pi-Hole. Really, give it a try if you didn’t, it’s ‘install once and forget’ type of software. Perhaps it should be updated periodically, but I don’t manage that. The only nuance with it, you need to have two computers, for the redundancy. Otherwise you’d be having downtimes when you need to turn off the SBC, or even reboot it.
I use it on a Raspberry Pi 2B and Orange Pi Zero, both work wonderfully for the task, and it looks like Pi-Hole can work fine even on a router. Both of my SBCs are passively cooled, that’s why I decided to comment on the photo: you don’t need a computer this powerful to run it. As far as I remember, my very first Raspberry Pi (v. 1B or something like that) handled this task very well too. I temporarily retired that SBC in favour of Orange Pi Zero, so I cannot say for sure, but I think that computer had no issues with being fast enough for Pi-Hole. Really, give it a try if you didn’t, it’s ‘install once and forget’ type of software. Perhaps it should be updated periodically, but I don’t manage that. The only nuance with it, you need to have two computers, for the redundancy. Otherwise you’d be having downtimes when you need to turn off the SBC, or even reboot it.