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You don't even need to buy the latest model. I've been running mine in a Pi Zero for +2 years without any problem.

I'd suggest getting an RPi with an ethernet port, I've got mine running on an original Raspberry Pi.

I tried setting up a 3B+ with pi-hole, but I think it was overheating...I had it set up on a first-gen Pi, and it still works great.

I'm running the Pi Zero with a micro usb to ethernet adapter