Does MonoGame support 8K TV's yet? x_X

graphics.PreferredBackBufferWidth = graphics.GraphicsDevice.DisplayMode.Width;
graphics.PreferredBackBufferHeight = graphics.GraphicsDevice.DisplayMode.Height;

But can you:
X = OVER 9,000;
Y = OVER 9,000;

MonoGame should be able to support whatever crazy resolutions the drivers support. We do not impose any limits on resolutions.

Plus these dx11 limits if you work on dx platforms. I would presume rendertargets to also work with the 16k limit.