Hi @M4DDO I have not used this app, though may want to have a look here https://cybernews.com/best-antivirus-software/totalav-antivirus-review/ https://play.google.com/store/apps/details?id=com.totalav.android&hl=en_GB&gl=US
Personally I do not think an Anti virus on Android is strictly necessary if you do not go outside official sources, I am happy with the security protection provided by Knox and McAfee Anti Virus is on Board should you wish to use it. However opinions vary and you may wish to have a look at this thread.
It's also recommended to check the permissions of apps you install. Plus Samsung already has a virusscanner installed by default 🙂 Having multiple scanners can be a bit messy (And will heavily impact performance). Not recommended at the very least 🙂