I have an Outback wagon and there are a couple of considerations that haven't been mentioned. First, there are chains and then there are chains. I've used both cables and chains and personally I prefer chains. IMO chains are far superior for traction.
Having said that, you should check your owner's manual for recommendations about chains. A lot of recent cars can only use "S-class" chains due to limited clearance between the tire and the suspension. If you try to use regular chains on such a car, you'll likely do damage.
Studded snow tires are an option, but depending on where you are going they may not get you past a roadblock. Here in California there are "chain stops" run by Caltrans or the highway patrol entering the higher-elevation areas of the mountains (where I live is at 6100'), and studded tires are NOT considered to be "traction devices" by the state. What is strange is that good studded tires are probably at least as good as cables, but cables pass muster and studded tires don't. Check the rules where you intend to go.
As for what wheels to put chains on, when I chain my Outback I put them on the front, since it helps to have the traction to pull the front end in the direction I want to go. When I chain my Toyota 4x4 truck I usually put them on the back, since that is where the truck is lightest and needs the most help. I carry chains for all four wheels for the truck, and there have been a very few occasions where I chained all four wheels. It's pretty amazing what you can get through with good snow tires and chains all around on a 4x4 with ground clearance. I'd just plan on using one set on your Subaru, you'll end up more limited by snow depth vs ground clearance than you will by lack of traction, as the Outback AWD is really pretty good.
In many areas of California, in moderate snow conditions you can get through a stop if you have all-weather tires and 4WD or AWD, but you must have chains with you, and often you'll have to show them to the officer. The officer can decide that everyone needs to chain up no matter what they are driving, and if you don't have chains on in such conditions they can cite you. YMMV, depending on where you are going. Also bear in mind that AWD helps you go, chains help you stop, and it's usually the stopping part that's going to keep you from wrinkling metal.
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