I set mine low enough so that I can use 5.5-6" long handles on them and still be in a comfortable enough position when pouring from them.
IF I have a longer tap handle on mine, I plan on getting a piece of straight bracket, and use a couple of rare earth magnets to hold it to the fridge door (in front, by the opening edge) with it going far enough over the freezer door that opening the freezer will open the fridge too.
IF I do that, I'll probably spray paint the bracket black, to match the fridge, so that you don't notice it. I figure a pair of the magnets I'm using to hold the drip tray in position (holding the brackets to the fridge door) should be enough (18# pull strength) to do the job.
If you've checked the service drawings for the fridge and confirmed that there's nothing running inside the side walls, then go for it. You'll have more flexibility that way. I would do that if I had the option.
IF you're really handy, you could build up a structure to hold the taps higher, that doubles as a way to get both doors to open when the freezer gets opened. Although that might be severe overkill for the job. Not to mention you'll need/want to insulate it and make sure enough cold air gets into it in order to keep the lines at the right temp to keep the beer in a good way...
