I looked in the manual for a mounting option, but it doesn't exist for the La Vague LV-HD340, it wasn't mentioned anywhere.
As an alternative, I would suggest this projector, which has the option of ceiling mounting, also offers the same resolution and also has WiFi to transfer the images from, for example, a smart phone to the projector without cables: LG CineBeam PH30N.
LG PH30N (HD, 250lm, battery, LED, 28dB)
Manufacturer Link:
https://www.lg.com/de...