I'm looking to mount a TV across the gap of a recessed window. The window is set a few inches back from the wall. The plan is to sink two screws into studs on either side of the window to fix the large VESA mount there, and then hang the TV on it.
As depicted, the stud finder I've been using detects stud centers about 5/8 - 3/4" from the edge of the window alcove. This was indicated consistently on both sides of the window, up and down a couple of feet.
I drilled preparatory holes to sink the screws, and I think what came out was wood, but I'm not entirely certain.
There was also a little bit of curved metal that came out of one of the holes, possibly part of a drywall screw? Given the layout of the room, it seems very unlikely that there's any electrical work in this location, so that's my best guess as to what it could be.
The TV is quite heavy and rather expensive so I'd really like to be sure that what I'm mounting it to is, in fact, wood. Is it possible that the stud finder is wrong? If so, what can I do to make sure that I'm placing the VESA mount in the right place? There's really not a better location for the TV.