So I've bought the nanokvm-usb. Why: I needed it quickly and was available the idea of going through another server for secutiry seemed better: I control the updates and security fixes well tested on the internetthe product itself costed around 50€ and I found a used mini pc with wireless connection for 25€ it was easy to install, works fine and is of good quality
So I got it working by buying an Terra MT47 modulator !thanks to @mayasynth@eldritch.cafe and her advices !
So what is happening is quite simple: I AM FRENCH which is considered bad when using old TVs. Why ? Because we use L and L' bandes when most modulator are using B/G or things like that So, that won't work properly.
Hugo is exactly the kind I don't want, WYSIWYG is important :D