WARNING!
Some people with 350 V2s can't run QGL without the hotend crashing into the camera mount. Apparently the config for the 350 QGL has it moving closer to the front than the 300 config. I don't know how the 250 behaves. So print this at your own "risk", the worst that will happen (probably) is that you'll need to reprint the bottom mount.

I have no issues on my 300s with this what so ever. Only if I plan to print very close to the front edge I might need to tilt the camera back.

All that said, there is a solution for mounting the camera in the back too but the camera angle is worse unfortunately

####### UPDATED V3 #######

Made a new solution for the flexcable path so the mount can be placed further away from the bed. So now there's less risk for the toolhead colliding with it. (Does not apply for 350 apparently! Don't know about 250)

##########################

Mounts on the extrusion in the front of the bed.
Holds the flex cable tight and folds away easily when needed.

You need:
3 x M3x20
3 x M3 Heat set inserts (or regular nuts + longer screws will probably work too)
2 x M3x8 + T-nuts for mounting to extrusion

On Voron 2.4 beware so that your hotend doesn´t crash into the mount during QGL. It´s a close call but this gives the best camera angle.

2024.06.08 - For 120 degree caneras, there's an 3mf with a negative cutout block

Camera casing is remixed from link.