I have a 2012 Forester, and it's become increasingly difficult to find a place where I can do an oil change.
My HOA frowns on it, but I think I'd have a better time of it using an extractor pump rather than the pan under the drain plug approach. And, using the extractor, it wouldn't be quite so obvious.
I've never used one, so I can't help on that. As for more information, in Google, type in the following string and you should get a bunch of hits:
oil extraction site:subaruforester.org
I use this technique a lot - finds all sorts of things. For some odd reason, the built-in search engine on this site never works for me.
Look around your area for a DIY garage, where you can rent a bay for an hour or so. Most military bases have Auto Craft Shops (or Auto Hobby Shops) that provide you with a bay plus basic tools - a good reason to join the military!
Suggest to the HOA that _they_ create/rent a space or bay for minor auto servicing. You are not alone - there are other residents who want to do this same thing. Become president of the HOA and you can force this through!
Find a local Subaru group and inquire if they know of an available service bay for DIY activities. Since a lot of Subaru types work on their vehicles continuously - particularly STi owners - they will probably know the terrain. Or, maybe they will loan you the empty bay in their garage (since their wife has probably move out because of the time they spend working on the #$%^& Subaru automobile)
If you get a Fumoto oil valve, it will make draining a bit easier (and quicker) - useful for stealth draining at 3:00am. If you get the Fumoto with a nipple, you can attach a hose and route the drained oil to another location (e.g. under your neighbor's car ;-}
Or, just go to any AutoZone store and drain the oil right in their parking lot. You won't need a drain pan - just drain it on the ground. Well, that's what they do at two local AutoZones.