@sergio-rius A little late, sorry, but that depends on the mosfets you are actually using. I am driving ~5m strips of white leds with most of my controllers and they don't even really get hot.
There is also a big(ish) update from my side concerning this project: I have designed, 3d printed and tested my own case for the controllers and they work great. I have just added the stl files and some images to the project page!!
For now this project is done from my side. The controllers have been working great for the past 2 years but due to the "huge" (~1s) delay with my Mysensors network (with signing and openhab on a raspi) when switching the leds I am currently testing some MQTT and wifi based RGBWW controller boards as an alternative.