PLA isn’t online, only in-person at Portuguese schools, in Portugal. So it’s only suitable if you actually live or will be in Portugal full-time for at the very least several months. Edit: Apparently EdPro is now offering an online PLA course, thanks for the correction guys!
To my knowledge, it’s the only other approved way of meeting the A2 requirement for citizenship than the CIPLE exams if you’re not from a Portuguese-speaking country.
This newsletter talks about how the PLA courses work in practice: