In my project I am employing a CM2009 IC between genuine VGA controller and VGA output connector. It is really pointed out in the datasheet for this IC which i can use EMI filters on HSYNC, VSYNC and DDC channels suitable right after IC and just before VGA connector. Although https://josueyipww.madmouseblog.com/11680857/dc-emi-filter-fundamentals-explained