Trying to install curtain rod brackets above the window alcove. It's an 190cm wide alcove in a newly built apartment in Denmark (think 2020ish). The windows go from ~60cm below the ceiling, all the way to the floor.
I got all my tools ready (hammer SDS drill with 6mm bit to match the 6mmx40mm rawlplugs), made the measurements and all, and eventually decided to buy a multidetector tool to look for wires and metal. It is Bosch's digital detector Truvo, with the 'traffic light' indicator. It reliably reacts around the electricity sources, but I am really confused regarding the metal detection. It tends to detect metal all around the window alcove. On the left and right side, it seems to detect continuous vertical lines of metal, about 10-15cm of the alcove, as if it were a frame.
Above the alcove and in the top corners, it consistently shows red areas every 10-15cm, and around them, some 'safer' areas with yellow, never fully green.
I tried to understand whether the window may have some structural beams (I don't know anything about construction) and learned a new word: lintels. I don't think it's a metal lintel, since it's not a constant horizontal line of metal above the alcove.
Anyway, this is very confusing because I want to install 3 brackets (2 in the corners, 1 in the middle) and all my careful calculations for the best symmetry and good curtain esthetics seem to be ruined by the detector constantly beeping and reporting metal underneath.
Am I overthinking it? Had I not bought the detector, I would've blissfully drilled into the walls and possibly everything would've been fine and I wouldn't have needed to ask myself all these questions.
The apartment is a rented one, so I'm also afraid of causing some structural damage and getting in trouble since I have no insights on what's inside the wall and how it was built. All I know is that it's made of some concrete and some brick.
Any advice or insights from construction connoisseurs or otherwise from personal experience would be welcome!
