Online = Banked.
Probably fewer than 50% of your residents have a bank account. Online rent collections are not a significant source of rent collections. Most residents pay rent on-site or by mail-in with a money order (those are the unbanked) or by check.
That said, accepting PayPal is a good idea. It will not be a significant source of rent collections either, however when a resident is unable to pay rent and is facing eviction, they will often tap a relative’s credit card at the last minute to pay their rent online via PayPal.
Your mileage may vary,