We assume you want the Aeotec multi-sensor 6 unless you tell us otherwise. You may substitute a multi-sensor 6 for a single Aeotec Door/Window sensor or recessed door sensor, or alternately two recessor mounting kits. Let us know your preference during checkout.
Battery powered is fine too, Zwave devices are a great selection for battery power. But battery powered devices require batteries, so please use the powered USB option if possible. It won’t be a lot of power.