When equipped with the battery powered LED lighting, we install 3/4" blocking on the rear of the cutout to allow for the battery pack clearance. On the blocking, there are metal "sawtooth" hangers for mounting to the wall. Two drywall screws with anchors will be enough to hold it.
The light switch is accessible without having to remove the sign from the wall.
If the product supports it, premium color changing LED light kits are available. These are also battery powered but come with a color selecting remote control. Choose from 44 settings, selecting from an unlimited number of colors and choose your lights to shine any color or cycle through a pattern of colors.