The Mantis and Tempest are both some popular funnel bases. They both are really good, you could use parts of those to make a TH9 layout. I usually have a small ring with powerful defenses and then an outer ring with defenses like archer towers and cannons, almost like an anti-hog base, but with a few compartments in the inner ring. Also place traps in the outer ring, giant bombs and spring traps work really well.

