FastMac ACE-7169 U-Socket Standard Duplex Dual Outlet Dual USB, 110V, 15AMP TruePower, White. .... Plug in your chargers NEXT to the outlets and keep the outlets free. Yes, this really does exist right now! This link goes to Amazon.
Griffin's PowerDock 5 $99 | This tabletop charging device has separate charging ports to plug in each device and has clear brackets allowing you to place up to five devices on the charger at once. Each charging bay has a 10W USB outlet to charge up to five tablets at once, and the bays are big enough to hold cased iPads. You’ll need to provide your own charging cables.