Get a blank plate like you would put where you have moved a lightswitch and are not wanting to restop and paint, drill a hole in it the size of the flexable loom. Electrical suppliers sell gromety things that take flexable conduits and have a thread and nut on the end to lock it in place, but I have never bothered and just make the hole the size of the smaller parts of the corrogations and bend it till it pops in place.
Mount the plate to the wall in a wallbox, or just use a couple of wall anchors if there is no stud close by.