Mount 5 Framsta panels on the wall

No one here can tell you much more than that you have no claim to warranty if it doesn't work.

Personally, I would try it. If I didn't feel good about it, I would screw it to the wall at the bottom. Since the brackets are not available as spare parts, for example, one could drill through the bottom strip (small hole at the back, large hole at the front), place a suitable piece of wood or something between the wall and the strip, and screw the strip firmly in place.

Somehow I will probably have to make do with something similar if the whole thing doesn't seem stable enough to me.

Maybe the fasteners are coincidentally in the bargain bin, there is (at least in the stores I've been to so far) a whole box with all kinds of Ikea fittings to rummage through and pick out...

If not, I would screw two solid (!) wide-angle brackets to the wall so that the panel row stands directly on them. Position the brackets and, if necessary, modify them so that you can screw the panels to the brackets using the threads intended for the feet (when mounting from the floor up), in the instructions on page 11, step 3.

That should then hold at least just as well as the left row, which is screwed to the cabinet.

Best regards