Looked like the course had placed markers for the final resting place for frustrated golfers!
Seemed to be only room for one at each hole so chances are they were there for some other reason.
Yep, turned out they are hole layouts etc which will be quite useful especially for newbies to the course.
However they have put them in the most peculiar places. Logic would have that the would be placed to the right of the tee box neared to the back (White) tee off.
But no, that is not the case. Many of them are actually forward of the tee boxes and some have already been hit by players driving off, also a huge potential hazard from balls richocheting from them back towards the players and caddies.
Good idea to have the hole layout on show, bad idea to put them where they have!