[bluish29]

I think pi-hole (Adguard home) is useful dns level ad blocker which can be used on network/router level. But it is limited, UBO provides you more flexibility to block cosmetics and certain ads that cannot be done via dns. There will be overlap of course but it is worth it. I agree that adguard here seems redundant and UBO itself recommend against using another ad blocker to avoid interference and websites adblock discovery.

However you might end up using

1. pi-hole on router

2. Adguard as device level DNS

3. UBO on Firefox (android only)

It is possible but not recommended and wasteful. 1/2 and 3 is enough.