That might be a big mistake. Laptops are hard to keep cool, in a cupboard under the TV (which I'm guessing is not that big, and from what you say, sealed) it's much more likely to overheat. And even if it doesn't get hot enough to shutdown it's going to run much hotter than it really should, and that will greatly shorten its life.My aim is to have my laptop in a cupboard under my TV, and then be able to turn it on and operate it from my phone, that way I won't have to open the cupboard and press the button.
Also the option to WOL from WAN and then be able to remote in whenever I need might be useful