Is this Wi-Fi repeater compatible with the Yallo Home Max fibre routers?
As far as I know, this is the Zyxel AX7501-B0 router.

If compatible, how do I set up the Fritz Repeater? Thank you very much!

Question

Is this Wi-Fi repeater compatible with the Yallo Home Max fibre routers? 
As far as I know, this is the Zyxel AX7501-B0 router.

If compatible, how do I set up the Fritz Repeater? Thank you very much!

Answer

yallo Home Max Fiber Box ... I can't really find any technical data ... but ... AX or WiFi6 he should know.
Regardless of that:
I would in any case not "experiment" with a mixture of hardware from different manufacturers.
A suitable AVM router for a "cable connection" can be found ... Zyxel AX7501-B0 would probably be compatible, but with about 500 € almost twice as expensive as an AVM router. I would use the AVM FRITZ!Box 5590 Fiber WLAN glass fibre router 2.4GHz, 5GHz for about 250 €.

Answer

Yes, that should work. You can find out how to set this up at the following link:
https://avm.de/service/wissensdatenbank/dok/FRITZ-Repeater-1200-AX/3487_FRITZ-Repeater-mit-Router-eines-anderen-Herstellers-verbinden/

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Question about AVM FRITZ!Repeater 1200 AX

Is this Wi-Fi repeater compatible with the Yallo Home Max fibre routers? As far as I know, this is the Zyxel AX7501-B0 router. If compatible, how do I set up the Fritz Repeater? Thank you very much!