Its not the height but the sphere size and illumination which is the key here.
I can easily mount them any old place if they have a stem, after all, you just make up or buy a clamp or screw through the middle of the tube. The point is that they need to run from a supply not the daft dark sensor solar ones, as the idea is to switch them on remotely from a cab. It will aid me getting to my house when its dark, since the cab can see the light come on, and hence I don't have to try to locate my place.
I also have had another idea. I used one of those tile things that work via bluetooth today, and although these work well, they are not very loud. What I need is either a tile with a bigger speaker or maybe one fixed at the bottom of a horn or something so you can hear it better. Brian