Why is Ali's Hollywood star located on the wall and not on the ground?

In 2002 Muhammad Ali was honoured with a star on the world famous Hollywood Walk of Fame  but it wasn’t like all the other stars In a break with tradition, the star was mounted on the wall instead of the pavement at the Kodak Theater entertainment complex The reason? Because the former boxer, 59 at the time said he did not want his name to be walked on by “people who have no respect for me”