I'm considering attaching a new towel rail to the drywall in my bathroom, with attachment points approximately marked by the yellow postit notes in this picture.

[![enter image description here](https://i.stack.imgur.com/32Fpw.jpg)](https://i.stack.imgur.com/32Fpw.jpg)

This is on the 21st floor of a condo building in Montreal (built in 2014). The building manager said the drywall is approximately 1" thick (a full inch! not a centimeter).

1. Is this really possible? (I haven't been able to get confirmation from anyone else).
2. If the drywall is really 1" thick, will the usual drywall anchors be effective? Usually the pictures I see of drywall anchors have them exceed the thickness of the drywall by around 1/2", and have expanders which end up significantly expanded after the screw is inserted. However, most anchors are at most 1" long, and in a 1" thick drywall, there probably won't be much room for the expanders to expand. Will this decrease the effectiveness of the anchors?
3. Another issue is the nearby thermostat/light switches. How do I make sure to avoid any of their wiring when drilling in the drywall anchors? Is it important to avoid them? Part of this I suppose comes down to how the wires are arranged behind thew all. Will they for example come bundled in a metal tube? (In this case hitting the metal tube may cause the tube to flex undesirably?
4. Is there anything else I need to watch for? How can I tell if there's plumbing behind the wall?
5. If I gently drill a small hole, poke into the hole with a toothpick and check there's nothing within an inch behind the wall to worry about, is that a guarantee I'll be fine?