Why do you want a lap for multiple monitor trading? The lap is far lessupgradable than desktop, usually significantly less powerful dollar for dollar, and impossibly a PIA to hook up additional monitors as you can see
Use a desktop for trading and a lap for everything else.
VGA splitter and HDMI splitter will project identical images on the additional monitor. I don't believe that's what the OP was asking. The OP was asking for each additional monitors displaying a different screen.