They can be used as in the above photo showing the in and out pipe going into the floor.
Lift them a little above the skirting board and they have a different sort of configuration. I looked at the radiators in my house and they are different even to this. They have a flexible water pipe hidden behind the radiator itself and so they sort of 'float' on the wall.
Being me, I just had to have this arrangement, Simple solution..... I just nipped off a bit of the pipe and stuck it on the back of its remaining stump.
Here it is, in situ, in the mud room.