In my project I'm employing a CM2009 IC between precise VGA controller and VGA output connector. It's talked about during the datasheet for this IC which i can use EMI filters on HSYNC, VSYNC and DDC channels proper following IC and just before VGA connector. Though there isn't any specs https://hud-helmet31975.worldblogged.com/37118133/emc-emi-filter-for-pv-inverters-an-overview