If you can build a staircase, an antler mount is a snap. The vertical cut behind the antlers is the most important so that the antlers mount flat and project forward. I did not watch these since I just screw the skull plates to a porch post.

https://www.youtube.com/watch?v=XyhBU_5ih0c

and another without leather

https://www.youtube.com/watch?v=W7cLwyGs0dw

or just google deer antler mount.