I've used two in Wanchai regularly. Sorry, no street addresses.

The first location, if you stand with Fleming Hotel to your back, directly across the Fleming Rd. in the alley off Lockhart is drop off. The second: walk out of Novotel in Wanchai, turn right and walk 1 block, on right side. Both charge by weight/load, pickup usually 2-3 hrs and they take everything!

Another suggestion which I've yet to test: with either android phone via google or iPhone via siri, ask when you arrive.