I've also installed these using a wireless mouse & keyboard.
I've booted from several of my PCLOS recent KDE remasters and from the PCLOS KDE 2018.6 live CD image. The touchpad configuration in system settings changes nothing regarding clicking. The buttons above and below the touchpad work correctly. The cursor moves correctly when the finger is moved on the touchpad. Two finger click may do just about anything.
Single finger click does not work at all. Recently purchased 3 Dell Latitude E6430 laptops and one E6440 laptop from ebay.