Exactly! That's the best option! And then we can add Matriarchs!
Grims don't bite back against Matriarchs :)
In my opinion, it's better to separate the Furies and put the Grooms in one powerful stack – a powerful stack means more bites, which means more damage.
I usually use Furies + Riders to take down neutrals.
This is the most effective combination, and against casters and archers, we simply separate the Furies.
Tactics + artifacts for speed + a skill for a speed aura – as a result, the Furies run all over the map :)