Spoken Realms Royalty Share (50/50) Plus
Spoken Realms is a production company that is a great alternative to the ACX path because - although not as straight-forward - they offer wider distribution opportunities. They have a Global Distribution option, which gets your audiobook on library streaming platforms, physical copies for sale at Walmart, and most everything in between. Royalty values vary by platform.
Like with an ACX RS+, there is an option at Spoken realms for shaing royalties 50/50 (narrators/author). And similarly, you pay a smaller PFH value (varies) to cover post-production costs directly.
This option works with multiple narrators.