I use this mesh access point with the Zyxel router from Yallo. Since Yallo belongs to Sunrise, I assume it is the same. Works fine; download the MPro Mesh app to your phone for installation. It's very easy to install, no technical knowledge needed.

I don't have it on the wall. But: As far as I can tell, hanging it directly on the wall is hardly possible. However, the base can be clipped into the back so that the part can then be hung on a screw on the wall. Without the base, the distance between the wall and the rear of the repeater (i.e. the socket) is approx. 6 mm (definitely too little, even for an angled plug; even the power supply unit could not be connected in this way). With the base as a "hanger", the distance is then about 17mm. A little difficult to explain, but I hope it's reasonably clear

Hello Use this guide: https://aselcom.com/Anexos%20PS/Manuales/WX3100-T0_V5.pdf#page143 It super exhaustive. Here you can find the firmware: https://www.zyxel.com/fr/fr/support/download?model=wx3100-t0

Is possible. Only the set-up is special. Don't follow the enclosed instructions, it won't work. But with the 'MPro Mesh' app from Zyxel, it works straight away and then everything runs smoothly.

i've been desperate for a week... i can't manage it... only via cable 💁🏼‍♂️

The Zyxel model you mention on the digitech site is the WX3100-T0, I bought it a few months ago. Be careful, it's not a router but an access point. This means that you need a wifi router and that the WX3100-T0 will be used to extend the wifi network. Have a nice day!