Root Android tablet with adequate SuperUser app

I'm an Android developer doing a project which requires rooting the device and doing some su task to fulfill the needs. The problem is that all the rooting software solutions that worked for me (iRoot, Kingoroot, Kingroot) have inadequate SuperUser app that brought TONS of additional malware stuff such as unintended lock screens, ads etc. Also, when my app does some su command the SuperUser app won't let it do it unless user accepts root permission in the dialog. I can't accept that - the app is running in kiosk mode on devices located in stores. I think there are two ways:

1. Please provide some rooting programm which has normal SuperUser app that won't do shady stuff and ask for root permission all the time (at first launch it would be ok, or set in the settings).


2. Or the rooting solution which won't install its own SuperUser app. I assume there are some decent SuperUser apps on the market that will allow my app do well.

The target devices run Android 4.4.2 version. Thanks in advance.