Although this frame has mounting points galore, for full fenders, there isn't anything to anchor the top of the rear mudguard between the seatstays. For stability, there is usually a way to fasten the guard to either a permanent or removable bridge between the stays. In an ideal world, the manufacturer would supply us with a bridge that can span the seatstays and be attached to the M5 bolts that are there. Does anyone know of anything that can be used in this case?
See here for example of bridge supplied with Vitus Venon:

I suppose you could rig something up with one or two cable ties, but it would be nice to have a more refined solution that was available off the shelf or could be 3d printed.
Example of permanent bridge:
