My only * to this would be Google Chromecast devices directly if you already have them.

They have an option (buried way under settings) to make the home-screen apps only.

> Turn on Apps only mode > From the Google TV home screen, select Settings Settings and then Accounts & Sign In. > Select your profile and then Apps only mode and then Turn on.

It also makes the device significantly more performant.

Great tip! I'd been using a custom launcher, but with this, I might not have to.