Yes, both are possible.
Most people will probably recommend you use fully kiosk for your tablet. if you do, You can use this to open any installed app on your tablet from the browser:
AND
As for your other question, it depends on how much effort you are willing to put into it. Almost everything is possible. I created an interactive floor plan of my apartment that shows most of my devices and let’s me toggle them on or off.
you could do the same with just a list in a single (super-) tile or you could create one dashboard per room. up to your imagination and ingenuity.