We have tested KeyPad on many tablet computers, phones and Android devices. Some of these have been tested by us some of them by our customers.
KeyPad is a bluetooth keyboard that is available to you at any time that you need it. Being a software implementation there is no limitation to the number of devices that you can use it with.
A great article with common shortcut keys you can use is at: https://www.howtogeek.com/175267/the-htg-guide-to-using-a-bluetooth-keyboard-with-your-android-device/
To install, put KeyPad into a discoverable mode, and connect from the device that you want to control. For your device, this is similar to connecting to a real bluetooth keyboard.