There are ways to make it work without the external monitor and without using the VirtualBoxI just has a Windows 10 experience. Trying to upgrade a Dell E6410 laptop. Installed Win 10 and find out this Dell model is not compatible, it boots into a blank screen. It works with an external monitor, but that defeats the purpose of a laptop.
It does run Win 10 in Linux in Virtualbox without a problem. Just be aware some older models may have problems with the Win 10 upgrade.