The iRobot Roomba i7+ used a grid pattern ... Like other Roombas, the i7+ doesn't have a remote, you must use the app to control it remotely however, you can start the vac without the app.

The i7+ has a large, bagged dust collector that ... your Roomba and other products in the range. Based around the iRobot Home App, it allows robot vacuum owners to fine-tune their settings ...