The TBDD is a solid choice, together with TB 110mm
Wheels you will have a very comfy ride.
Due to the proper wheels and dampening DD are even quieter than Hubmotors.
Can you link the Deck you choose?
The DD are a bit more energy hungry than Hubs, to achieve the range you are looking for you need to have enough space for the battery under your Deck.
There is also the Revel Direct Drive kit, which is kind of similar to the Mellow Drive with the difference being a DD kit. It’s also highly regarded and worth looking into.
Revel at the "brand" new competitor in the direct drive Esk8 race!
Edit*
DD are pushable, however the TBDD are big powerfull motors with strong magnets, they will have more resistance than the small Chinese hubs.
Since you are conquering some hills too I would advise for the 75KV variant.