Compatibility List For Apartment Life have links to most business-related mods that were tested and used with either Apartment Life or Mansion&Garden.
Check the business mods near the bottom of the list as you will see some of these mods that sound like what you're looking for.
As for relevant wages, Pescado's
Relevant Wages + Wage Fixes does deal with employee wages as the description stated.
Let us know if you don't find a particular mod you're looking for.