Is this really a thing? Every opener I have ever had came with a clip to put it on the sun visor. Which is where Ford put the homelink opener on my F150. What's the difference between pushing a button on the remote on the visor verses six inches the the right? But if you must rig it to one of the aux switches remember the remotes work off of a 3 volt battery reduce the voltage from the switch, (12 volts). But if you just don't want to see the opener I suggest simply using velco or 3M automotive trim double sided tape and attach it under the dash panel that is under the steering column.