The ISR etch labels in me link above includes yer vehicles identity recorded on a register. If yer heap is stolen then tell them and they will put it in the register details. Anyone finding the vehicle can ring them or look on their website to see if the I'd is listed as stolen or not. Link also etched with yer unique I'd number ont window.
The etch kit etches windows. It also has other labels to etch paintwork and plastics. They also do desperate labels for cat and dpf marking anorl. Both ont same register.
There's multiple options fer security. Stop it being nicked. Make it more difficult to nick. Mark it to help someone spot it's nicked at a later date. The last one is yer only hope when it's gone. Sad but true.