I think all LED's are one-way polarity. Installing the wrong way would only mean the bulb wouldn't work. If you look at the base of the bulb there is only one metal wire, not like regular bulbs which have two.
Ilyakol, don't worry about changing the bulb. Just be careful. I found out from the service manual that there is a correct way to change the bulbs. You're supposed to take the housing out of the footwell and disconnect the harness, THEN replace the bulb. I doubt that you would even need to disconnect the battery but I still recommend it. Wish I would have found that info sooner.