not like if your wallets are online you are always scared of some hacks happens from your device.
I read there is one other best way that can be tried but currently Samsung 2018 product users are free to use it, I don't know if other smartphones have it, i.e. activate the samsung safe folder, move the wallet application into the safe folder and hide the safe folder.
https://www.androidauthority.com/samsung-secure-folder-908758/
will check this certainly today if how safe and how to use.