To help with installation, we designed our own quick release wall hardware that is available at checkout for $12. The hardware screws into the wall and has a matching bracket that attaches to the inside of the radiator cover. The hardware allows easy and tool-less removal of the cover when necessary, however when in place it holds the cover to prevent it from tipping over. This will mount on any radiator cover sold by us provided there is at least 1" clearance above the cover (beware of window sills, etc). Recessed radiators that are embedded in the wall (not the traditional free standing units) will need some special consideration - aside from the standard of adding 1" in height to your radiator and 2" in length, you'll have to add an additional 2" in length (a total of 4" added to interior length and 1" added to interior height).
We also have anti-tip furniture straps that are commonly available for furniture. They allow the radiator cover to tip until the strap catches it and prevents it from actually tipping over. The straps are constructed of a steel cable and solid steel fasteners and include all installation hardware and instructions. The set is so strong, it only needs a single cable attached at the approximate middle of the radiator cover to the wall. They are $10 per set.
We strongly recommend testing your installation on a periodic basis to ensure it is still secure and reliable.