Of course, first for my PC I use comodo, adware and Malwarebytes (free).
Concerning IPAD and Android I'm not shure. On my IPAd (Android) I installed Malwarebytes, too (but now Malwarbyte has his politics changed, as I seems, so I don't have anymore it) and comodo (but don't know, how sure it is). But I'm a little paranoid concernig security.
From time to time I use hitman pro (free) and eset online scanner (free, too) to check my PC. None of the programmes found anything after examinations, besides e.g. PUP.