This is a mounting bracket for a logitech c270 using some very nice clip-on LED lamps from Amazon (link below). You can mount above or below. I'm using m2x12 screws, but m2.3 would also work. Lamp ring has a hole for a nut/bolt/thumbscrew, but the ring is tight enough on the lamp that I have not had to use them. This works quite well for octoprint in my basement workshop without having to leave the room lights on at all hours. I just clip it to the table top. Hope it works for you.

Link to lamps: https://www.amazon.com/gp/product/B07BBR81SP/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=10