Spotted on Aliexpress and point a few quid a pair so bought some. When they arrived several weeks later I had a go at fitting one of them but they don’t really lend themselves to a neat fitting on the ZT.
After a bit of experimenting I found the best position for the lamp to be mounted on the door and the small magnetic trigger piece that sticks onto the door sill. Not what you would say was concealed but it worked.
I must admit I was quite impressed with the strength of the little light and the good definition of the logo. Although there is an on/off switch (I guess to switch the thing off during the summer months) I wonder how long the batteries will last.