I have two EO Mini and they've been faultless in terms of plug and play. One is tethered and one is not, only because that one sits on the outside of the garage and I didn't want a cable there. The other one is inside the garage.
The units are super small / unobtrusive.
The app is a bit shit though. Not really much features or updates.
My dad has a Wallbox and that seems good too. Better app, still small enough not to stand out.
I'd recommend either.