whenever I move mouse cursor @left edge of the screen I'm brough to the gnome shell screen with the ability to choose among various windows / apps.
Not in latest Cinnamon.
Anyway Cinnamon is a fork of gnome-shell. This means that a developer taken the source and changed it. It still depends on other GNOME3 stack packages.
MATE is no option. It depends on old unmaintained/deprecated code. It might even collide with pacakages from Entropy/Gentoo. You better be sure what you are doing.