I own many security camera systems and about 20 of them are Arlo cameras. I use the camera mounts that come with the Arlo kits in various situations. For outdoor use, I like the more traditional 1/4" screw mount and swivel bracket. They stay aimed better, don't get knocked down by falling branches and make it harder for someone to steal a camera. Magnetic mounts are fine indoors and in sheltered areas that are out of reach.
I purchased this mount for "table-top" use...meaning wherever I want to position an Arlo camera on a flat surface. It can be mounted to a wall or ceiling (I believe), so that makes it very flexible. The design gives me more flexibility in the position of the camera than the half-ball magnetic mounts that come in the camera kits.
Bottom line: this is a good mount for interior or sheltered and out of reach outdoor locations. For most outdoor locations, I recommend the 1/4" screw mount arm offered by Netgear (or others)