There's potentially a lot.
Shawn obviously for his solo career and DX. Triple H likely will be some day, again for his solo career and DX. You can maybe even argue Chyna deserves 2 seperate inductions. All the members of the original nWo (Hogan, Hall, Nash, and I'd probably even include Biscoff). All the members of the SHIELD someday in the distant future should get double inductions.
This one is a stretch, but I think you can argue Jim Cornette deserves one with the Midnight Express, and one for his solo accomplishments.