How about growing it in a vase like Ryan is doing?
Neo in Glass
He has a Neo and Neostylis growing like that and his experiment seems to be working out well.
If you do decide to stick to the traditional sphag mound method I would still consider leaving a hole in it. If you leave it as a solid mound, in low humidity the outer layer will dry out very fast, and the core will still stay quite wet, making watering tricky. That the trouble I had with my Neos. The hollow mound will help the sphag dry out evenly. You don't have to use sphag, these will also grow well in bark based mixes too.