I tried this route as well first, since I had an Pi 3B lying around not being used. However, after having the Pi-Hole FTL service crashing multiple times a week and completely stopping the whole network from getting Internet access I ditched it. This was using the latest Pi-Hole version on latest Raspian. Some searching the Internet turned up some results about memory usage and such but the logs never showed anything actionable and I gave up on troubleshooting it and just went for NextDNS instead.