Genshin Impact controller for Ipad / iphone recommendations (less than 40 euro)?

I started playing the game Genshin Impact on my iPad / mobile phone.

I'm not a gamer and have little experience, but I've heard that you can play the game better with a controller.

I decided to try it out and bought a controller from the company "Marvo" (model Gt-62) controller on Otto.

Now I had to find out that this controller is not supported by Genshin impact.

I also tried it in the settings in Genshin Impact (i.e. Via settings and then on controls but there was no gamepad)

I've heard that Xbox and Playstation 4 controllers work well with this.

The question is which inexpensive controllers are good for gaming (and which can also be connected to my ipad)

Ps: It would be useful if you could send me a link from an amazon / ebay / otto controller, if you have one that you can recommend

You don't need a controller for a game like Genshin Impact, but if you really want to, just buy a PS-4 controller.

Have played the game myself, but don't play it anymore.