Groundfloor Seri has the hottest cruising toilets at the right side next to the entrance of the department store.This one also has the stalls with the glory holes (last 2 on the right side) all as indicated by BB.I checked out all the toilet in the whole mall and there are no more gloryholes except some I think on the first floor but they are so small - only suitable for babies.

Now; for Thais groundfloor= 1st floor.First floor = 2nd floor a.s.o I dono why- just an Asian thing. Anyhow this toilet is on the lowest floor possible floor.