Lots of people are saying latte dock is the best but my KDE doesn't have it and I tried to install it but I didn't get the search result in software center. Is there any deb package I can download and install?
I'm using Kali Linux KDE version

Latte Dock was only recently moved over to the KDE repositories. Presumably it ought to be included with newer Plasma releases (not sure if 5.13.x, but likely in 5.14).

It also looks like they just posted a new tarball on the kde store page on Saturday which you can download, compile and install