4 outputs that's a lot for your graphic card.... so it will naturally heat.
However that shouldn't be problem, I've let mine overheat for hours .. it didn't melt.
Letting some air flow underneath the bottom can be a good idea, but personally, usually I don't care.
Eventually you could get a laptop cooler pad such as:https://www.google.fr/?client=safari#q= ... cooler+pad
but you'll have to sacrifice on the style....