Can I get a proper tiling window manager in KDE [closed]

First of all KDE is not a window manager, kwin is. KDE does not rely on kwin, so you can replace it with any other window manager, including tiling ones, that you like. One possibility of doing this is setting the KDEWM environment variable to the binary of your window manager before running startkde.

Second, there exist tiling window managers that have the functionality of virtual desktops being designated as floating desktops. You are probably aware of that feature already.

Third, it is not possible to have a different window manager for each virtual desktop. The reason is that virtual desktops are not a concept in X11. Instead they are achieved by the window manager manually showing/hiding windows when switching desktops. There is some standardization on that, meaning there are custom, but standardized tags to identify the virtual desktop of windows. This enables other X11 clients (like a desktop switcher applet) to recognize the virtual desktop layout.However, the X server only allows one single window manager per screen which then implements the virtual desktop behavior.

You could install Compiz and set the configuration to have no window decorations and turn on the compiz grid option too ! Hope this helps