Re: two or three security apps installation is good or bad for phone?
An antivirus is always a good idea. Clean Master, or any app written by Cheetah, is a bad idea - they don't understand how Android works, they write apps as if Android were Windows (which usually cause the problem they're claiming to fix). I have no idea what quik seal is.
Malwarebytes Anti-Malware is also good to have running to catch malware that's not a virus or Trojan. (I was playing around with my desktop this morning and got something from a website that was causing me strange problems. Malwarebytes found 3 pieces of malware, quarantined them, and the computer is back to normal.)
(Anyone saying you don't need an antivirus on a Linux computer - which is what Android is - has never spent 16 hours [6 of us, all working fast] removing a virus from 400 Linux boxes that came in a "free gift" email that a few idiots opened. And the worst virus ever - that almost took the entire internet down - was a *nix virus.)