A short post of dongles working in my setup (MBPro late 2016, 15"):
Club3D USB-C to Displayport Adapter CAC-1507 ( 4k 60Hz with Panasonic VIERA 65AX800 )
Club3D USB-C to HDMI 2.0 Adapter 1611 ( 4k 60Hz with Panasonic VIERA 65AX800 )
With both I had to reboot the 2016 MBPro 15".
Apple Thunderbolt 3 to Thunderbolt 2 Adapter (worked with my old Elgato Thunderbolt SSD)
noName USB-C to USB 3.0 adapter no problem pairing Apple Wireless Keyboard 2, Magic Trackpad 2, Magic Mouse 2
Club3D USB-C to Displayport Adapter CAC-1507 ( 4k 60Hz with Panasonic VIERA 65AX800 )
Club3D USB-C to HDMI 2.0 Adapter 1611 ( 4k 60Hz with Panasonic VIERA 65AX800 )
With both I had to reboot the 2016 MBPro 15".
Apple Thunderbolt 3 to Thunderbolt 2 Adapter (worked with my old Elgato Thunderbolt SSD)
noName USB-C to USB 3.0 adapter no problem pairing Apple Wireless Keyboard 2, Magic Trackpad 2, Magic Mouse 2