Which iPad Mini model fits perfectly well on SPARK RC ? And any WIFI issues on iPad Mini ?

I use the iPad Mini 4, I have used wifi and OTG without any issues.

I use an iPad Mini 3 cellular with mine.

I saw some comments, that not all iPad Mini models fits well on the RC, (size wise). so 3 and 4 fits well ?

I use an iPad mini 2 (w/ OTG) and it fits/works fine

Ipad Mini is perfect, and something like this really helps. http://amzn.to/2v2rVae

Another ipad mini 4 here, fits tight, works fine.