If you load One of the Mega Bezel base presets, (e.g. \shaders\shaders_slang\bezel\Mega_Bezel\Presets\Base_CRT_Presets\MBZ__3__STD__GDV.slangp) set the aspect to 16x9, and the “Non-Integer Scale %” to 95.00, you will get this.
Pretty much the game screen with some surrounding Bezel/Reflections. You could also change the Bezel color to something a bit lighter.
That last shot is using a 240p DREZ base preset to show scanlines, with some tweaks to the corner rotation offset, and a 25.00 Value for the Bezel color. (You could use the Scanline Opposite Direction Multiplier parameter or fake scanlines at 240p… instead of a DREZ preset.)