What hardware and firmware for DIY LED laser?

Hello, i would like to ask you what controller board and firmware do you recommend for LED DIY laser with working area 500x500mm?

I build CoreXY 200x200 with SKR 1.4Turbo and Marlin with 30W NEJE laser module. It works but the PWM logic is inverted which is not the best solution for me. I want something bigger. I think Core XY is not good for bigger sizes because of the much longer belts. So please some recommendations Thank you!