Trouble with Teamviewer, X and Window manager on headless server

What I need to achieve is this: 1. Run Teamviewer host on Ubuntu headless server CLI 2. Increase the resolution to something workable 3. Open a browser on the server through TV without installing a complete desktop enviroment. 1) I got working but the problem is the resolution is only 640x480 when no monitor is connected. 2) I got working as well (when connected to a monitor) but it breaks Teamviewer. To increase the resolution I tried things such as adding a line to Grub or install the dummby xorg driver and use a dummby config. This all breaks Teamviewer. Basically on a out of the box 18.04 server install as soon as you install something like xinit or whatever Teamviewer will just not work anymore. I think this is because after installing the above it is not detecting a monitor anymore because as soon as I connect a monitor I Teamviewer starts working again. Also all commands I can find such as xrandr always say unable to open monitor, even with a real monitor connected.