Which iPad should I buy to safely run DJay Pro? Do I need an Air, Mini or Pro or the budget iPad 7 would work?

Setup configuration: DDJ 400, iPhone 11 and Mac Mini

I am Running DJay on a 2018 iPad Without any Problems

Although the large iPad pro is cool :-).

I would say the 9.7 iPad 6th generation or above

I use djay 2 and djay on an iPad Air 2 with a WeGO4.

Awesome! And you guys also plug controllers?