You could think of two L straps of either steel or aluminum similar to the attached photo. They should be 3mm thick, 20mm wide and 60cm long on each side. They have to be reinforced by a diagonal member of the same cross section welded.
They can be attached to a metal tray big enough to support the projector preferably with srapps to tie in.
The two metal angles have two holes near the top and bottom to allow for proper anchors to the wall. The anchors need to resist 160kg pull out force. Like expansive bolts for concrete or lag bolts going through the studs.
After OP's edited their question and the fact that this projector is being used commercially I recommend these modifications.
- Use steel angle 4cm x 4cm by 5mm thick for legs of the bracket and the frame of the tray. Weld all corners.
- Use 3mm thick steel plate for the tray.