The only company allowed to drop off/pick up at Bell Services is Scooterbug. This company is the exclusive partner and can drop off the stroller at bell services before you arrive and pick it up after you leave.
I believe a couple of rental companies now have spaces at the airport so you can pick up/drop off there or you can arrange a delivery at the hotel, but you would have to be there in person to pick up the stroller and return it.