Does XIM Apex really work for Xbox one S for razer, asus, logitech keyboards and mice?

it should work, but remember that not all the games support mouse and keyboard.

I use a £7 wireless one for typing on it and it works a charm. The majority of keyboards and mice will work. Corsair and Razer have their keyboards fully supported.

Unfortunately, there are no offical Xbox One mice that can directly connect to the Xbox One without a reciever.

Even the
Razer Turret keyboard and mouse combo that's specifically made for the Xbox One has their own receiver dongle.

So to answer your question: You don't/can't use a wireless mouse on the Xbox One without a receiver.

Correct, I am using a Logitech wireless mouse and keyboard with a dongle, there is no other way to connect a mouse wirelessly.

maybe you could reach out to Asus to verify if their keyboard is compatible with the Xbox One. https://www.asus.com/us/Keyboards-Mice/Cerberus-Keyboard/HelpDesk_Knowledge/

Xbox supports wireless receivers for mice and keyboards, so yes, it should work.

Only Bluetooth devices are not supported. Logitech devices are not BT wireless, so should be okay.