Hi marioa62862708,
Acrobat can be installed on 2 systems but you can activate it only on one system at a given time.
For activating it on more then 1 devices you need to have the same number or licences or you can go for a volume licence purchase.
For mobile devices like iPad there is no Acrobat application, you will only be able to download & install free Acrobat Reader app. Adobe Acrobat Reader on the App Store.
Regards,
Aadesh