Like a lot of other lapdocks this accepts HDMI input and comes with cables so you can connect devices like Raspberry Pis to it.
I always use phosh. It is designed to be a convergent DE and some folks internally do use it on their desktop computers as well. It uses relatively standard keyboard bindings that behave like you would expect in desktop mode and is featureful enough for me, while still being lightweight.
I used to be incredibly opinionated and picky about DE features, but that was two decades ago when I was using things like enlightenment and fluxbox. I used to very carefully place windows in specific locations and use those window managersā window memory features to restore those precise locations. Once it became clear that most modern shells werenāt going to support window memory, and I switched to one, I found that my real needs were actually pretty simple. Ultimately these days what I need out of a DE is a way to launch applications with a keybinding (super->a or super->s in phosh), tile and maximize windows with a keybinding (super->right/left-up in phosh), and alt-tab through open windows. Phosh also has a keybinding that lets you move windows between screens (shift->super->left/right) which is handy when docked.