No problem. The 3 high altitude frequencies listed all transmit from Goose Bay, so controller reception would be very good. These sectors would also be combined with the southern ones when traffic is slow so at times you would have a very big chunk of airspace covered. These are the high VHF sectors adjacent to the Gander Oceanic areas, so you would hear the westbound traffic making first contact on VHF after coming off the NAT tracks on HF, or getting the handoff to Gander on HF eastbound.
And my usual comment about not trying to scan too many frequencies. The way it's set up now, with just the low sectors works well, I think adding the high sectors would be too much. So hopefully the operator will pick either one or the other, but not both at once. Or maybe alternate between the two (high/low) periodically. My vote would be for the high sectors. Just my 2 cents. DJ