Q.Can An Eastern Or Carolina Hemlock Be Plated Under Or Near A Mixture Of Mature Maples And Buckeyes?
The site is 4100 feet elevation. Gets very strong winds at times any time of year because we are on west facing side of Roan Mountain and can see forever. Trees would be near the north boundary of a National Forest but can be planted in an open area.

Certified GKH Gardening Expert
They would need to be planted in a protected area rather than in the open because they don't handle strong winds well. The soil also should be acidic and they need regular moisture in the early years. Here is more:
https://www.gardeningknowhow.com/ornamental/trees/hemlock/canadian-hemlock-care.htm
https://www.gardeningknowhow.com/ornamental/trees/hemlock/growing-hemlock-trees.htm